Malicious PDF — malware analysis report

Static analysis result for SHA-256 396ab0c623b9acca…

MALICIOUS

PDF

95.7 KB Created: 2021-03-06 22:26:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 477165c65645c04d3348b5c76cb637e9 SHA-1: 21f30b980369dee1a7d487383282819fb9058fe3 SHA-256: 396ab0c623b9accaf71d4876f74366cbc464a5a813523df13d40ec6481d5319c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007. The primary attack pattern appears to be a link farm, potentially for SEO manipulation or to host malicious content, with a spearphishing attachment vector being the most probable initial access method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/123?utm_term=self+reliant+meaning+in+bengali PDF link annotation
    • https://sutukedepebovi.weebly.com/uploads/1/3/4/7/134753024/pupofipoze_jurobejiju_mafase_zuxegitokoxosar.pdfIn PDF document text
    • https://buvefejam.weebly.com/uploads/1/3/1/4/131453018/2893676.pdfIn PDF document text
    • https://tidatulo.weebly.com/uploads/1/3/2/8/132815220/1983446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_6035261b2e731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_5fdaafb01b394.pdfIn PDF document text
    • https://bifawodeg.weebly.com/uploads/1/3/5/3/135348479/4734138e35c3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_601330fe6ff7d.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/57631340729.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/can_a_humidifier_work_without_a_filter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482870/normal_5fd2a21ed584f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497082/normal_5fca301b84ff6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_8b9f3b4672154de5ac4686ac7f8f3357.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawe/ximebi.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/9908576257.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/chatrapathi_telugu_video_songs_hd_1080p.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_271545392ea64f9883d0921e372b82e1.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_df2b5eed7bab4c08958b8989ad5d892c.pdf?index=trueIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_dc82d3fe9d284ba9aef51f783ec04d17.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_08f68a5641394edd97befc0579de2b9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vajefam/softonic_google_chrome_latest_version.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_ca99bdedd9454f01a9138900f131a613.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_87ffaa9d92e649ac9a2725060e45cc42.pdf?index=trueIn PDF document text
    • http://litorow.myartsonline.com/ff7_walkthrough_remake_chapter_17.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/fur_elise_piano_sheet_music_beginners_free.pdfIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_2cf3790590684724bc3a9af34cb593b0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000135e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x135E9 18488 bytes
SHA-256: 1f259bb76bec3cf518860a1f1bbfa27a4c57885871053a99102196b51df834a3
font_00_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 4832 bytes
SHA-256: 49c677739366cc4c74f95b2441eded6d324e3c47d1a6f859ff68f7dac3cb099b
font_01_sfnt_off0001103c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 11268 bytes
SHA-256: b7cd75c4fa107aa0833307a67f4c40d184294a031ec981e00d2e2517dd2bc656
font_03_sfnt_off00015302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15302 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
font_04_sfnt_off00016101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16101 3928 bytes
SHA-256: 62771aaa428350274816ad311c66b91d1438c865573eecad02952f01d22b11d0

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