Malicious PDF — malware analysis report

Static analysis result for SHA-256 7645e437d372a739…

MALICIOUS

PDF

109.4 KB Created: 2021-03-27 15:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9cf9e55c7f5b2daf9128fc942d031006 SHA-1: 1ceaa8cd45d71c1b64c82e3b0869715c49e819fb SHA-256: 7645e437d372a739e56d84d22f31a0a6c2558e57eeed874ccdc439dc3ead1958
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://golowaki.ru/award?keyword=akrotiri+board+game+rules+pdf PDF link annotation
    • http://opensalle.xyz/what_is_a_guardian_ad_litem_looking_for9v2sf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_600d24e3cbc26.pdfIn PDF document text
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/zisoji.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/1254091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_6037c89913bc6.pdfIn PDF document text
    • https://totaduwuvib.weebly.com/uploads/1/3/0/9/130969262/169cc9216251c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_603eaf3d194ab.pdfIn PDF document text
    • https://lekomitigukajar.weebly.com/uploads/1/3/5/3/135345412/kaxapapofig_tizenapafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486061/normal_60208433f2f97.pdfIn PDF document text
    • http://mexicotop3.xyz/wiskunde_cursus_vubur81c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5ff4cf6ad1191.pdfIn PDF document text
    • http://faponabon.mygamesonline.org/98220568815.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavezusi.onlinewebshop.net/gajowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a24b3e9-d4e1-48ba-8770-8e6dad8c379e/amplificator_chitara_fender_mustang_i_v.2_20w.pdfIn PDF document text
    • https://e064a861-6c7b-46af-b67a-66be1f32d776.filesusr.com/ugd/ec3e4b_c18375c8e50e4b8f86fca8dace403853.pdf?index=trueIn PDF document text
    • http://tosabukevosubar.myartsonline.com/best_business_plan_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1135c47a-2633-4fde-96e4-e7ee44d0c7a8/76792743563.pdfIn PDF document text
    • https://4192d618-ecd7-4808-8485-efd4d6773ded.filesusr.com/ugd/17a5db_7a150cdb34a6421c83d4280f657f038b.pdf?index=trueIn PDF document text
    • http://jadukubilelib.myartsonline.com/ciaphas_cain_defender_of_the_imperium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/466c1260-45bc-48cb-b5d4-b63c53e62ef7/why_is_my_hotpoint_washing_machine_so_loud_when_spinning.pdfIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/xisogozilenepirog.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDC 5552 bytes
SHA-256: b9d7bd5470874184d1c7bc841daa4d2b7d85f6b66a83360cc486ac7339594515
font_01_sfnt_off00017fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FA9 11708 bytes
SHA-256: 7b523d814cb03531e9438188e43d2e0a66d00a3d7556291566d7c79c7d1dce7a

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