Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f136df71ae065f8…

MALICIOUS

PDF

64.8 KB Created: 2021-01-26 11:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 36fb44a00a421ff7080031ba6793ac93 SHA-1: c2ce47d3d38f7ea2d7916ad1f60063da006b826c SHA-256: 7f136df71ae065f8500b00e108ab3f564dfb0b490ed592df652171bde1c2c08d
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity designed to redirect users to potentially harmful sites.

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://trafffe.ru/aws?utm_term=alaska+information+technology PDF link annotation
    • https://cdn.sqhk.co/vodadavubex/6jbxmjb/beromubokolilupoja.pdfIn PDF document text
    • http://teagreen.space/green_pants_mens_jacket5cw9k.pdfIn PDF document text
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/228716.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/ib8jcji/xuboxonekudogobapufax.pdfIn PDF document text
    • http://belplitka.ru/local_buy_sell_tradecenst.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/hgLjfXW/unity_vector2_intersection.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/hgjhgge/fameji.pdfIn PDF document text
    • http://pinegrvuig.fun/9933161405pek5w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5fe6a441bc79d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392877/normal_5fe26e0591439.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/cUicl1W/xiaomi_airdots_driver_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/iSsZjed/duniraj.pdfIn PDF document text
    • http://morpeoplelife.ru/events_that_happened_in_exploration_and_colonization_eradbn9g.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/vajefam/fortnite_cheat_sheet_boogie_down.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/gomebavetunona.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_off0000bd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4A 5448 bytes
SHA-256: 0145e78053e09685edda549f0291e569a08bb9f7be611a0e838f547c51b2e2da
font_01_sfnt_off0000cfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB8 11392 bytes
SHA-256: fbd011499455d256a98458f7705c8c5963ad8aa98ee2e95481e616a10530e157

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