Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84281f12d76ceb5…

MALICIOUS

PDF

81.8 KB Created: 2021-02-11 15:59:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 016a36dc07facf0fc58e3671148ee807 SHA-1: 82bce3fc59a7e10b05fea7bf3bca1567b68210dc SHA-256: f84281f12d76ceb5ab0678e715300b57f663e3c0897cde22dafe82ff44915489
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or SEO poisoning attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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/wix?keyword=ff14+hud+layout+ps4 PDF link annotation
    • https://cdn.sqhk.co/tifesiwafo/ghjjjAA/xidufixuneki.pdfIn PDF document text
    • https://cdn.sqhk.co/julubesaf/idjkgg8/gipari.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/fqwighc/spin_warriors_istanbul_mod_apk_revdl.pdfIn PDF document text
    • https://kujuxase.weebly.com/uploads/1/3/4/5/134584075/552660.pdfIn PDF document text
    • https://tusigidufamem.weebly.com/uploads/1/3/5/3/135350313/pimupidopivepop-sosurebana-deremukegowi.pdfIn PDF document text
    • http://jotupati.22web.org/gawedefopilabisavovowim.pdfIn PDF document text
    • http://ellmax-site.xyz/8316551918fl6gz.pdfIn PDF document text
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/e4e3f85c706b87.pdfIn PDF document text
    • https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/4794947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://migusopugaj.epizy.com/android_mobile_developer_skills.pdfIn PDF document text
    • http://niwewoxupasobu.epizy.com/night_sky_app_android.pdfIn PDF document text
    • http://voxonirejeze.epizy.com/61891235443.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 3088 bytes
SHA-256: fe25772003dcff4aef7ce146b39af43ef78ac719d4f45a89b67806cd61a6ab18
font_01_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 5232 bytes
SHA-256: eee46022a0a706e760622b0f12a4fe4e56bc2b9990ef330df8640e6ba5daebab
font_02_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 10868 bytes
SHA-256: d13a5d344cbe5751484d2e6d3ac544646da5ea2c9b62eeddd1115191e9463b63
font_03_sfnt_off00012559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 16120 bytes
SHA-256: cf1f5adb226054e61b48b869043dcbfeac2ed8a78db67378db5d542e5772dc50

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