Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd3f410f3a7f0d8…

MALICIOUS

PDF

85.3 KB Created: 2021-03-30 00:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8fc4c29775e85c01c827aa49c5eb0a4b SHA-1: 45d6b215e9b8ce6572f63ac445b61ca28e3bc65b SHA-256: 8bd3f410f3a7f0d894b13971a1d8742946eb9e89b2651740655a0fbd798567e4
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or SEO spamming operation. The presence of external URIs and a link farm heuristic indicates the document's primary purpose is to redirect users to potentially harmful external content.

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://druttle.ru/wix?keyword=bleach+tatsuki+x+reader PDF link annotation
    • http://findssldz.xyz/7366143117bw2ak.pdfIn PDF document text
    • http://yesitalia.fun/17058745174ja2ew.pdfIn PDF document text
    • http://bozesedixek.mywebcommunity.org/gixoxerofevogonasolajov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_605621270504a.pdfIn PDF document text
    • http://liketime.fun/alimentos_transgenicos_definiciono7kcv.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/tutorial_adobe_premiere_pro_cs4_bahasa_indonesia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499283/normal_5fef06433c923.pdfIn PDF document text
    • http://vigastlens.xyz/6912195104h29d0.pdfIn PDF document text
    • https://cdn.sqhk.co/febenanedibu/lgcjcdV/76582007925.pdfIn PDF document text
    • http://vorecan.fun/hello_stranger_barbara_lewis_sheet_musiccpnha.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/FMCXHge/real_piano_teacher_apk_download.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/vesiwogupegapovezotidi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366346/normal_5fe25437eaa3c.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/aircraft_structures_2_notes.pdfIn PDF document text
    • http://trysol.xyz/kicker_pt250_10_subwoofer_with_built-in_100w_amplifier_reviewt2l6m.pdfIn PDF document text
    • http://natur-bio.space/dobukezc1piq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_5fe74ecff1aea.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/cugehaV/vintage_snake_eyes_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_5fb36e1ca8af4d55968f6000a204c48f.pdf?index=trueIn PDF document text
    • http://duxegejuw.atwebpages.com/girifevim.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_95f1fef405e94a19a1fbfae0fd65c3db.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_f9a30c66399f47568f3241f9b4e78085.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 4876 bytes
SHA-256: 244203ac2907369a5f7e6f13763b29e158ee9b40e93eceb034c08db70b4f2035
font_01_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 23152 bytes
SHA-256: 49bb72536eefc5d2736d35858f172aa0e6c6c0d588ea1ea327d690aa1ea054e0
font_02_sfnt_off00013816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13816 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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