Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb41a8c7a93f1abd…

MALICIOUS

PDF

80.2 KB Created: 2020-11-25 18:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e41797501fce20a7da41f19185662181 SHA-1: d86b58fbba33a3e7054d7563f5d5e7e3f2da78f3 SHA-256: bb41a8c7a93f1abdab5997ce7cde99ace69f262b0a04eef02220320fca537057
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=pathfinder+intimidate+feats PDF link annotation
    • https://naxosunibeg.weebly.com/uploads/1/3/4/6/134676516/8775285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_5f9c7cdaf15eb.pdfIn PDF document text
    • https://xasigevas.weebly.com/uploads/1/3/4/5/134595911/3511143.pdfIn PDF document text
    • https://tokomekenipejo.weebly.com/uploads/1/3/4/4/134441443/4a2ef8117281e1.pdfIn PDF document text
    • https://sedogosep.weebly.com/uploads/1/3/4/4/134486754/2882571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5fb25d1aa108f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/4857743007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3de9464-0449-4c5b-b653-97188da607da/95816837642.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/black_boy_full_text.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/mastering_the_art_of_french_cooking_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90d6a92-b49b-408f-94ae-a315f8be8fdf/29203233344.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/bukilutevavipurigixute.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/abs_cbn_tambayan_pinoy_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/60019176558.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_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 5116 bytes
SHA-256: 2936a99347c85500d488aa2db45fc92be5e3009521c52b9867bb5fd2d6952e9b
font_01_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 11340 bytes
SHA-256: 8f954098f0c887b6149ae99966b257dde800a7663560e6445db40f4af9e83a08

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