Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a29a22248bdd07…

MALICIOUS

PDF

81.1 KB Created: 2021-03-02 18:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6140caa3a4364074dcafc44022875695 SHA-1: d79130fa46b5cf56edc894ec17307f3307b0ccca SHA-256: f4a29a22248bdd072cc2555327fc9b69dc5821a4c8d5f578b677e56964619057
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of 'curl_testgrcfr.pdf' in the document text further indicates an attempt to execute commands or download payloads.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://golowaki.ru/strik?utm_term=malibu+lighting+transformer+instructions PDF link annotation
    • http://twobigs.space/senior_arm_curl_testgrcfr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407060/normal_6039b96c81b7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_602d993953078.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4455876/normal_601a1b9f11bd0.pdfIn PDF document text
    • http://tenakororor.iblogger.org/61862666965.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/BjishbZ/tiere_stricken_anleitung_deutsch.pdfIn PDF document text
    • http://antonioita.fun/motuwozeminilizakujotuzozwb7xl.pdfIn PDF document text
    • https://cdn.sqhk.co/merojuniv/hghahd9/top_20_classic_american_muscle_cars.pdfIn PDF document text
    • http://shopmzm.site/compress_size_file_onlinek82ei.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_60092e3b04aa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424630/normal_602c8e99a21d3.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/eLidkja/final_order_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389599/normal_5ff30fd43ce8f.pdfIn PDF document text
    • http://rezltml.xyz/friction_and_gravity_worksheet_a8gwph.pdfIn PDF document text
    • http://trysoda.pro/door_opening_sound_effecthb5rq.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/iiidhgb/occupational_therapy_definition_of_play.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jemumanapumaze.epizy.com/29128261097.pdfIn PDF document text
    • http://buwomonemagup.epizy.com/what_is_the_meaning_of_the_word_martha.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_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 5440 bytes
SHA-256: 77f8cd18b4499ef4c124d331a6e58d12bfcfd09e74ff347243a1e75a335febe6
font_01_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 10556 bytes
SHA-256: 6672e5b1cbef6842f647ac22d05b619427eb24860ff344cd28b2058f7db71d30

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