Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d77bb83fd0906a…

MALICIOUS

PDF

84.9 KB Created: 2021-03-18 18:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 54111aa93db509fbe891cd6abe55c517 SHA-1: 14be15e8968b1655f967977ed3ff0338270a78f8 SHA-256: f5d77bb83fd0906ad4b3e146a974e63d799ac97de1e4be3168d80e87ad06dfbd
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 0.9958

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://leonvi.ru/123?utm_term=astrology+answers+gemini+daily+2018 PDF link annotation
    • https://cdn.sqhk.co/fukonovum/jjghhiX/zynn_rewards_pending.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/7QzfQgh/companies_act_2006.pdfIn PDF document text
    • https://zapokeboxopi.weebly.com/uploads/1/3/0/7/130776852/4a2add7e1bc8.pdfIn PDF document text
    • https://volokosebu.weebly.com/uploads/1/3/4/8/134871595/dozevaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_6036d10c3a47e.pdfIn PDF document text
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/9955206.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/jT3CuNz/jalikanunomuto.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/b9a6b.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/Zjaigih/nudupudon.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/504360c33a33f0.pdfIn PDF document text
    • https://bometisuvuxop.weebly.com/uploads/1/3/4/6/134684792/1927280.pdfIn PDF document text
    • https://cdn.sqhk.co/muwizavo/hfiiDjf/12_minibattles_two_player_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_604b178a2c0e2.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/8781339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_600a51cdbd206.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/hbFTiaY/2017_football_playoffs_nfl.pdfIn PDF document text
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/1157274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_6018aee275fa9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486036/normal_5fcce40e9d1ed.pdfIn PDF document text
    • https://wikifepum.weebly.com/uploads/1/3/3/9/133986434/ragurap.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/dHOwbhs/move_the_box_hamburg_level_21.pdfIn PDF document text
    • https://lokanasa.weebly.com/uploads/1/3/5/2/135299929/1b6755a2a3158e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_35eafec7da184aa18c6dc3c8fad4e9b3.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_b8ca1a60f7a149309dec8c8f7ef8b160.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_7c6ef4c8955b437b8e5c755f4afd74e8.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_664b68d95dfa4bcea62cdba00f1d4bd7.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_924925cec0734aefb597e19f479a39e0.pdf?index=trueIn 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_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 5848 bytes
SHA-256: bd3b122617f2f89b88d6b6fbcbdf6bd75be19f80b104ad2e3873f456b93c1926
font_01_sfnt_off00012102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 10580 bytes
SHA-256: df2165f771b031534e282f7ff834700e98187275b090812cf4217cb748b73987