Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b540f3d12fe477…

MALICIOUS

PDF

61.6 KB Created: 2020-12-18 03:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d84189a2bb1130c01738459eccdcbc4f SHA-1: efbd09aa5a0afd4a2309df8e8a5ddcf608f40219 SHA-256: 31b540f3d12fe4773ed93ea2614bceb9510878787634ee048994be0932da7c43
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs, 'https://trafffe.ru/123?utm_term=free+online+breakout+classic+games', is likely part of this scheme. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?utm_term=free+online+breakout+classic+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fbb721aaeab6.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/divoridixefa_vinanajuv_vekilovukosubo_tumipokajejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_5fdbaa313e056.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/werolajaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_5f963a836f837.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5fcf229ab2e0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5fd9ae92a3e76.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/vaxebisapesi/73544504377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e526227-d664-4536-8d38-8b3bb8d2fca3/catcher_in_the_rye_test_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/teaching_strategies_for_low_income_students.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/sadugapeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee2e2830-3935-43c4-a64b-ead38440ca32/81098274516.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_off0000b388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB388 5276 bytes
SHA-256: 2dc4d1d3300a97426a199ce9de9c0e316a8627c7c2b408d55b324b5ec185992e
font_01_sfnt_off0000c56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56C 10692 bytes
SHA-256: 341083047e680922c9d8cbbc4893e40326e28d10ab68e04750bd93e5fcfc2ee0

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