Malicious PDF — malware analysis report

Static analysis result for SHA-256 b924f2f752445800…

MALICIOUS

PDF

77.3 KB Created: 2021-02-20 04:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6e7cc81b2caf0764c0e48f3be9debd22 SHA-1: a742a1636d767691334d6dde2dbb33bfa95cc096 SHA-256: b924f2f752445800b27627f5fb1ac5724e815e433a4dc3e7bb61a9cab5750aa3
194 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute traffic to various potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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.
  • 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://druttle.ru/strik?utm_term=grove+scissor+lift+manual PDF link annotation
    • http://zebrait.fun/thermodynamics_in_materials_science_dehoff_solutionsjekxa.pdfIn PDF document text
    • http://reduslim-officialsite.site/wuxafuuf4so.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/1hf9jf1/ben_hill_umc_app.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/how_to_analyze_data_in_research_proposal1v27v.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuxemop/ifvOGyx/55099785300.pdfIn PDF document text
    • https://cdn.sqhk.co/tukutabu/hfoy0jd/funavejukomobukibu.pdfIn PDF document text
    • http://help-verification.com/dyson_dc39_partswejke.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/g9FVQOe/sedexewejij.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/d941a30.pdfIn PDF document text
    • http://mklhhhh.space/airmans_information_manualvqzjo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://raxusitusumulag.rf.gd/venom_2018_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/83390355164.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_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 5120 bytes
SHA-256: 6c1f67141d60bac93822551afd5d1b3fd1a0e68f256c9a2c2871819c2b946f6f
font_01_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 12288 bytes
SHA-256: 031ab60bf4d6883b0e5d584afd0574a6c2910911dc6ec9d448041eedbde97239

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