Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c164674976ba740…

MALICIOUS

PDF

81.6 KB Created: 2021-06-12 01:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e93670a7b8f2a4cd914e1ae746e97b31 SHA-1: 9c03ffba2e713c8decb3f0460472d9236b06cac9 SHA-256: 0c164674976ba740de20eccecde88f273fceaf79ab73fb567774a1388da04001
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/pbw?utm_term=bribe+ullu+web+series PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453729/normal_6030dcbae0296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_60625f22d958d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425211/normal_603aaa4aec530.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4493550/normal_60b13696d9cb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_604b53735948f.pdfIn PDF document text
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/tikagipibobojax_lerukevutof_tekusakitukul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370764/normal_6007ce57c7e25.pdfIn PDF document text
    • https://lozagazol.weebly.com/uploads/1/3/4/2/134266804/6006029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_60427ddc0242c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_5fd7dfc12ef40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380068/normal_5fcf0a528009b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377663/normal_5fc9cca08eb8c.pdfIn PDF document text
    • https://kawotubizon.weebly.com/uploads/1/3/1/8/131871780/lafolafak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406777/normal_5ffba005c2b48.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/6f253ef4703dd5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/67405849-8b7f-492c-8052-d7f1d2b8d77a/wevokugizutobapidoginuxax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40aa079-5b07-4d37-83a0-c361085e0dc9/boondocks_season_1_download_mp4_zip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec67ec6-13c5-42cf-a387-6652177f8736/multiplying_rational_numbers_powerpoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/893466e2-40c3-48b6-8c4b-552bfc042bf2/boesemani_rainbowfish_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e43878-ed44-44e4-91b9-f4c7a6639c52/check_your_computer_specs_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d45d81-f616-4973-b80b-41837ea25a47/how_to_make_low_poly_blender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb7f38b-6dd5-452d-b12c-17339273de41/80077356598.pdfIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 4748 bytes
SHA-256: 5e019a9f3ef0885c6a436297cb9f44f8b2b101b8bcd6c741ed2fcfc68b8b25c2
font_01_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 11176 bytes
SHA-256: 552d2ae40819f0b20a166dcd0daf3ebce8d197fc65d236d7857db915effac038
font_02_sfnt_off0001183a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183A 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349
font_03_sfnt_off00012d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8B 2664 bytes
SHA-256: e53fc8e1c193885e64582451b149ffef235cf8286e2ccb8e12fac6fc67bbf3e7