Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff86727a71302199…

MALICIOUS

PDF

73.5 KB Created: 2020-11-12 21:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 903dbbe72d76f4e95644b32a6db3ff54 SHA-1: 9c8d8d6c0870a6f2fcee800525156bd26164affe SHA-256: ff86727a71302199839cd947f4ed950854c9c599aa3201ae3b3a576043aed6c7
156 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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffi.ru/strik?utm_term=assassin%2527s+creed+3+pc+flickering PDF link annotation
    • https://livabawixegi.weebly.com/uploads/1/3/4/3/134320323/vifovagovegipanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f92ad8a2088e.pdfIn PDF document text
    • https://ruvetuse.weebly.com/uploads/1/3/4/6/134618438/nokiwan.pdfIn PDF document text
    • https://kobigaxa.weebly.com/uploads/1/3/3/9/133997295/423951.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/pepadopejutawum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e1f41f-4cb8-4568-943f-b5a8b0246c86/kiwuzeteri.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/daramesebal.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/29179749366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d5f1e0-0ea2-4c87-aee2-58b9970a1f68/economics_mcconnell_20th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2dbb03a-64d2-4a66-88d9-6234b9afd24c/26989174472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/750ab458-14b8-49ff-aaaf-d5966095e404/56754829566.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/movozodoloxig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76fc3412-f40c-446a-a506-773e5fb4a5e0/rutukotinejiwuvanujo.pdfIn PDF document text
    • https://www.youtube.com/watch?v=GWwSAYJCoGkIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 5576 bytes
SHA-256: 28e4cd652b666c800f6ed79855f63dc5755f50cc1a35814a2e27964e900099e6
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 12260 bytes
SHA-256: 522519de4c960ccb0e1c6a1d1f151dded8c8b240e0c2e2bed59eee1a6b4ba75c

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