Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bd107b45ecab3f…

MALICIOUS

PDF

67.8 KB Created: 2020-11-12 23:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7e0d529a377dea125ff83a9a45225e5e SHA-1: 950d7a96f30c60313bd1caa297b8bfd4f2cb3c8a SHA-256: 56bd107b45ecab3f0b90d4951798974865cab34f6b964d5d84190b450c4cda43
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/123?utm_term=castle+rock+entertainment+clg+wiki PDF link annotation
    • https://lukumupanulafaz.weebly.com/uploads/1/3/4/6/134683212/guberov-dinazatef-lunonobabala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f87623d1d4f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5f957488173dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_5fa8a7f7901e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_5fa6b0c7940fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_5fad72bb3526e.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/8824325.pdfIn PDF document text
    • https://sivivaleretuvu.weebly.com/uploads/1/3/4/3/134324596/razimun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_5f9ba8a6d26db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f9cfbd6ea8f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5f8b842e86785.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/628ab47e-afd7-44f1-b6df-3baf5a9e717a/29743283617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea84aaaf-a25c-432a-a1fe-7a20756a0938/touching_spirit_bear_study_guide_que.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85443973-5d2d-4319-ab10-3208adb64386/5325159555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8ed834-910c-4256-9f8d-b548cfc781b4/68510496991.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

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_off0000cbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD8 5180 bytes
SHA-256: 971952ab6297f0b2806641ae9fbfff822243760948bbb0ee55bdd2b4a47d81ee
font_01_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 11020 bytes
SHA-256: 3669bc25918592064cc852ab652ab0289ea214daaed43c45dbd596979a7dafd8

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