Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60b93b045eb9941…

MALICIOUS

PDF

60.4 KB Created: 2021-01-11 22:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 71cb64a42462d912e268fc90cc1b7ee3 SHA-1: 3ac0ccb00ea967ccc75e3a7a6dee1c46d29a4c76 SHA-256: a60b93b045eb99411de6012f5b747b82c4ed652ae1afc2f1d15ee80e09e06c44
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/aws?utm_term=cfdi+en+linea+manual PDF link annotation
    • https://cdn.sqhk.co/makubeku/hifGcbL/paxful_bitcoin_wallet_app_download.pdfIn PDF document text
    • https://site-1180710.mozfiles.com/files/1180710/gamecube_super_smash_bros_melee_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5fe8152a90bb7.pdfIn PDF document text
    • https://site-1173903.mozfiles.com/files/1173903/airport_city_weekend_code_twitter.pdfIn PDF document text
    • https://xosuloduviz.weebly.com/uploads/1/3/4/8/134890731/417ed6c9426dca.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/0QkJUcK/gekinum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382613/normal_5ff20b10b5f5c.pdfIn PDF document text
    • https://site-1179585.mozfiles.com/files/1179585/electrical_apprentice_jobs_hiring_near_me.pdfIn PDF document text
    • https://site-1183491.mozfiles.com/files/1183491/senukibawudebuguwawit.pdfIn PDF document text
    • https://detosujedeke.weebly.com/uploads/1/3/4/3/134371576/pixufu-josabuso-sifamabukeri.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/polexebuj/64690851893.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/62056198702.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/bawarchi_full_movie_mp4.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_off0000b2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F2 4684 bytes
SHA-256: 63e01bb68d54beaf7d5deb4d8362a6292e9b6ab458a9fa09fb6dae3f4d263c04
font_01_sfnt_off0000c2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CE 9612 bytes
SHA-256: b6e5a6c00612900b0924e007d7c7a0fc0a493f2b3c68604714bad26e5a78c73b

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