Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b2e15ab9eff891…

MALICIOUS

PDF

77.8 KB Created: 2021-04-21 21:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b34ee868bb0b388b8cb4a4efec6cd4f9 SHA-1: fa3165a25e5f143d9c36fd16edc43f8795d59ec7 SHA-256: f4b2e15ab9eff8911c5b07d895514e12b9d47c78e365a82d5c6c5a70da45aa53
164 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a significant number of external links, suggesting a link farm or redirection mechanism to malicious sites. The presence of a download button lure further supports a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/strik?utm_term=d%2526d+warlock+spell+guide
    • https://cdn-cms.f-static.net/uploads/4487007/normal_60581b60ae8b0.pdf
    • https://cdn-cms.f-static.net/uploads/4391909/normal_5fe7dd6bb2f5b.pdf
    • https://cdn-cms.f-static.net/uploads/4487918/normal_6067efd9ac2ac.pdf
    • https://cdn.sqhk.co/lexuxeza/bfwjgLZ/pezemininodududagapu.pdf
    • http://vozobatenaw.mywebcommunity.org/ceclor_bd_750_bula.pdf
    • https://cdn.sqhk.co/rawatajizefu/hfxjahe/31194692676.pdf
    • https://cdn.sqhk.co/lediname/hiShfhf/platform_games_list_pc.pdf
    • https://cdn-cms.f-static.net/uploads/4483336/normal_60302687b1261.pdf
    • https://cdn-cms.f-static.net/uploads/4474746/normal_5fd899d07601a.pdf
    • http://gelufose.scienceontheweb.net/neliwotuparipodat.pdf
    • http://zoguponuwuxoli.medianewsonline.com/juwavokeminomapove.pdf
    • http://dasiwujupuna.sportsontheweb.net/beats_studio_wireless_manual.pdf
    • https://cdn.sqhk.co/zogameva/Fhgbgjo/rupipukugog.pdf
    • http://fuzabura.sportsontheweb.net/6745611049.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kulebosux.myartsonline.com/13971532487.pdf
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_a3b5aad0a1e1440892f5253cff2e62b8.pdf?index=true
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_9a1fccc061bb47fb88560dda6b1b32bd.pdf?index=true
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_6d8a10706beb44dea480ef4badc81490.pdf?index=true
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_83e40ef26b3848f7bbf0218fae6b72bd.pdf?index=true
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_ae0470f12b3e45c5ab752d6942da9743.pdf?index=true
    • http://wiwosotu.myartsonline.com/bapitavegapivi.pdf
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_44694b433aa14069b1a20f32975add0c.pdf?index=true
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_0e1b82ec5dfa4c2f96bc59790ef3c27d.pdf?index=true
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_a52915a6760043b3acff90384a54a72e.pdf?index=true
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_946eeb45ad6c4d078426dc60ff9e437e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ca.bin
3c306e0ec94285d13e87c04bb9d91e20e74eae243bb960c666b01ded030faf74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CA 4156 bytes
font_01_sfnt_off000102f7.bin
7a0c3b6f9201877dddba4a01f9234b00a3c762244b569d6b3f0c15a2c2708ae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 11712 bytes

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