Malicious PDF — malware analysis report

Static analysis result for SHA-256 167fe3bd94a78292…

MALICIOUS

PDF

83.2 KB Created: 2021-01-25 13:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2df67d59e6a7141d5811aafb45f2e8d5 SHA-1: e973e24ef1589a62e569af375458842f33b873d9 SHA-256: 167fe3bd94a7829280d7a28b073bb3f71cc6fce552460099c956f8c68eb35467
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool. The numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicate a link farm designed to obscure the ultimate destination, which is likely malicious.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=wavelet+neural+network+pdf In PDF document text
    • https://gejipowuxenufo.weebly.com/uploads/1/3/4/6/134681439/tigezifi-kagezerer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_600bf1c0e9aa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_5fdc71b9863ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477162/normal_5fe07f9aefe86.pdfIn PDF document text
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/fusore_miwetova.pdfIn PDF document text
    • http://xekuluw.iblogger.org/file_from_s3_to_local_java.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445879/normal_5ffe25a7165e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5fe88f75af294.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipijiz.epizy.com/charts_and_graphs_worksheets_2nd_grade.pdfIn PDF document text
    • http://foripoj.epizy.com/21477728796.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/manujitiji.pdfIn PDF document text
    • http://monawob.epizy.com/some_information_about_sound_card.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/jabesezukeserires.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/character_analysis_worksheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/xubuxivisamogafege.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_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 5084 bytes
SHA-256: 63c6a9a492e8d7484a21cd8d815a374b9adbb153e33adbee5dc49ce4bf24593d
font_01_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 12132 bytes
SHA-256: f224b6d08aca4f9f97e7169f9b54b8ab9b9367c83f521ee4dce175aaf3cd6616

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