Malicious PDF — malware analysis report

Static analysis result for SHA-256 c937171dc4cdffac…

MALICIOUS

PDF

83.5 KB Created: 2021-03-03 05:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 604f7411d613f816bb6c8af9109af02b SHA-1: 3ec930f9025d0eab12a66542f1abfca7f032d213 SHA-256: c937171dc4cdffacdead4c153f725aa08084461006a7148485070fdcba9a2688
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample was flagged by a machine learning classifier and ClamAV as malicious. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a fake browser update or extension. The presence of numerous external URIs, many pointing to disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crophysi.ru/123?utm_term=snowflake+method+software PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446168/normal_5fda74e152c92.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/igfibgc/64880876588.pdfIn PDF document text
    • https://cdn.sqhk.co/fufitefan/jiaGpgc/zombie_invasion_section_2_wallpaper_engine_for_pc.pdfIn PDF document text
    • http://ruginegil.22web.org/72814507774.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/0BtkIU9/zedudotosatobanaxuru.pdfIn PDF document text
    • http://saletipaja.22web.org/sosofatiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495551/normal_5ff8bef9259be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miloxirabufa.epizy.com/nowasovexomejupadidekos.pdfIn PDF document text
    • http://xuramilipadig.rf.gd/81852444284.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/sword_coast_backgrounds.pdfIn PDF document text
    • http://wexalaz.epizy.com/17798082633.pdfIn PDF document text
    • http://pivirujifija.epizy.com/lukudimodabavajijevene.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 5408 bytes
SHA-256: 37cec10837ff37957621b13cf89834845782ac4a45292af8bc1ab1f7a50dbcda
font_01_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 12872 bytes
SHA-256: b5bb9dfc88e6a1fc319927ba740c1405d833001f7a6c92c961d73bc6fef00a25

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