Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b754452a612bec1…

MALICIOUS

PDF

73.9 KB Created: 2021-01-22 06:24:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 44a1a1ae260956fef145aabc52e4f9f4 SHA-1: e81c0ff518f76d8e21d5bc8704fbba5ae7286ee0 SHA-256: 5b754452a612bec18c325a63db0bb02ca9c7305e9da626ff1b7444660ef992c5
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one pointing to 'trafffe.ru', suggesting it's designed to redirect users to potentially harmful sites. The PDF's structure and the presence of multiple disposable host links further support its use as a link farm for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=cuisinart+charcoal+water+filters+bed+bath+beyond PDF link annotation
    • https://cdn.sqhk.co/gubujurit/xggigjO/hobbyking_6ch_rc_flight_simulator_controller.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_5fd6f33d5909a.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/id45Kgh/diy_wood_display_cabinet_plans.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/HfVehjG/selodaronuvebubakoluna.pdfIn PDF document text
    • http://getegenufiduso.66ghz.com/jubugone.pdfIn PDF document text
    • https://cdn.sqhk.co/nedivixozu/biieLIt/64333752693.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/early_neonatal_sepsis_guideline_aap.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/Chdjihj/lowutabuwovegevikidogasow.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/jeiagem/snake_oil_salesmen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_5fd6446e6fab6.pdfIn PDF document text
    • https://cdn.sqhk.co/lorakerasima/d1haCgi/dalawixoguveberowixanag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413223/normal_5ffc3adb37e6d.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/dZ1ngew/launcher_theme_app_for_android_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/zixedagiro/yghK5ih/super_retro_16_full_apk_1._9._6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dujisuga.epizy.com/vasupizuguxufudebude.pdfIn PDF document text
    • http://vakakumiwizexoj.epizy.com/76047899679.pdfIn PDF document text
    • http://pewesinelukaveb.epizy.com/rijixam.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_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 5348 bytes
SHA-256: c414b77f2aed18a2efb68f6e6afc56a2d346081cc6d2fe202d722ca275ca7b88
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 11292 bytes
SHA-256: 0beb1cc362ce2626782cb21818fa1e1df89e51fd29e600943a0dff754407915c

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