Malicious PDF — malware analysis report

Static analysis result for SHA-256 70842138c8ed50a6…

MALICIOUS

PDF

80.0 KB Created: 2021-02-28 13:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f2b74d75c8881339ed5ceffbe10b2994 SHA-1: 7b452559c812066023c47c23979d06dd964661b6 SHA-256: 70842138c8ed50a66bf643ebce8afb5c4b4b7acaf823e8499e1d71c89acc7d67
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, many hosted on disposable domains or link shorteners. The primary URL, zajinet.ru, is associated with a search query about resetting a car's security light, suggesting a lure to trick users into clicking malicious links.

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://zajinet.ru/strik?utm_term=how+to+reset+security+light+on+1998+chevy+silverado PDF link annotation
    • https://cdn.sqhk.co/vefomatakin/hiTUPib/39653880022.pdfIn PDF document text
    • https://kisumeselebo.weebly.com/uploads/1/3/6/0/136021012/6288261.pdfIn PDF document text
    • https://wosixuluwur.weebly.com/uploads/1/3/1/0/131071196/tipuwud.pdfIn PDF document text
    • https://cdn.sqhk.co/sujutowupolu/bGgibgj/gamechanger_team_manager_subscription.pdfIn PDF document text
    • https://luxaxila.weebly.com/uploads/1/3/0/8/130814132/6947727.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/duzuditaxijalej.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/72516026233.pdfIn PDF document text
    • https://pidexijot.weebly.com/uploads/1/3/5/3/135316959/cb4c9a9fd964.pdfIn PDF document text
    • https://favobilumosuxo.weebly.com/uploads/1/3/4/7/134733594/watuv.pdfIn PDF document text
    • https://cdn.sqhk.co/xenaporo/iehcfFR/us_park_police_salary_scale.pdfIn PDF document text
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/81d93848af.pdfIn PDF document text
    • https://jiwozipepogi.weebly.com/uploads/1/3/4/4/134462700/806fd962829117b.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/cFhgDjg/46966480616.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/ghdXigJ/98698304571.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/gdiggdP/motor_sims_2_downloads_hair.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/bhdmzUP/pegexafimifef.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/vogubivajavofu/canada_visa_work_permit_application_form.pdfIn PDF document text
    • http://livirava.atwebpages.com/sutojowevepibubolino.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_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 5820 bytes
SHA-256: 0ab6b355d1bb580cb6e924ef620fea43be23f7e18d456837357295be6a3d6fa6
font_01_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 10544 bytes
SHA-256: a617586a13572ecdbdab1fe7cad874430747f389f52a12e3cba6314972aae1d5

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