Malicious PDF — malware analysis report

Static analysis result for SHA-256 904e3d751ec30ebf…

MALICIOUS

PDF

73.4 KB Created: 2021-02-11 22:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a67222fb37b9d707dd66ccaf3398371d SHA-1: 1868849b1f36d3fc3f65d8c4d6e8e1563a4819f8 SHA-256: 904e3d751ec30ebffb83612024ea17daade29948cea7c094453dec351f2fa883
186 Risk Score

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 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://jottigo.ru/123?utm_term=hydrogen+sulfide+lewis+dot+structure PDF link annotation
    • http://leduxebawini.22web.org/wutajajejejelewoxageva.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/mufulijokagimo-teweja-nilopiwefoza.pdfIn PDF document text
    • http://mercelus.xyz/test_marketing_definition_economicskhksm.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/kiwevotirogife.pdfIn PDF document text
    • https://misetibu.weebly.com/uploads/1/3/1/4/131438078/7576369.pdfIn PDF document text
    • https://susudomi.weebly.com/uploads/1/3/5/3/135319884/pelifelu-nujofudejosaxuz-pufotol-miravizabu.pdfIn PDF document text
    • https://cdn.sqhk.co/bofilewidil/a1iagjJ/nyse_stock_exchange_holidays_2018.pdfIn PDF document text
    • http://fruit-citrus.space/best_pilates_reformer_classes_near_me1me2p.pdfIn PDF document text
    • http://bokulidedasez.22web.org/angielski_czasy_przysze_wiczenia.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/iFjfBwM/block_square_jigsaw_puzzle_by_hierarchical_loop_constraints.pdfIn PDF document text
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/1570484.pdfIn PDF document text
    • https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/a2a020.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/h32cgix/44697654370.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/gudag-nowisa-reluxawapul.pdfIn PDF document text
    • https://cdn.sqhk.co/konarolikomu/d5ij5Km/sniper_counter_attack_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwumuni.epizy.com/82188229634.pdfIn PDF document text
    • http://suvemavukefejig.epizy.com/homard_bleu_treport.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_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 5132 bytes
SHA-256: 2ae3b5c0f6d03b07428a5acafb60ce51eb76ca6d15c47b52c68497ddd19810ea
font_01_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 10836 bytes
SHA-256: 8d555f67e747686c46395261968a784bf1a691a8f0d7d62c8067a67922224995

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