Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73b6049aba877d9…

MALICIOUS

PDF

88.1 KB Created: 2021-03-01 11:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e45c930154fb5cab3b2aea1d83003955 SHA-1: d38a079c6e49efa8d92a4c3fde834b1ec262c62c SHA-256: b73b6049aba877d940e5282a50b27974464e8b3a835187350444bf03525458b9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a domain associated with link farming and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

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
  • 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://maypoin.ru/123?utm_term=sword+art+online+light+novel+collection PDF link annotation
    • http://urott-hu.com/85224185045qadlr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388285/normal_5ff8c374cd5bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_6018ad5e74d3a.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/gfbiaop/kazuj.pdfIn PDF document text
    • http://winsl.space/64341415139uigxn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_6017b1fc34b3d.pdfIn PDF document text
    • http://pannochki-art.com/sififibonaztxe5.pdfIn PDF document text
    • http://imm-shoes2.club/536608453697p8m2.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/gfjbNid/fumeperafunatutevedusil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxajetolalet.epizy.com/ethiopian_reporter_english_news.pdfIn PDF document text
    • http://reroxiki.epizy.com/polytune_2_vs_3_mini.pdfIn PDF document text
    • http://koxaxinum.epizy.com/28930580992.pdfIn PDF document text
    • http://gevogorusitaw.epizy.com/pusuj.pdfIn PDF document text
    • http://zexubadisaki.rf.gd/vaastav_movie_filmywap_in_hd.pdfIn PDF document text
    • http://saripugoxek.rf.gd/nonfiction_text_features_worksheet_5th_grade.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_off00011b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 5276 bytes
SHA-256: 88447f7d0c5171904f152560a547789c8ff8103b33f03d41b3ebd5fb82b1d02a
font_01_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 11188 bytes
SHA-256: e2c09c34777a6db8622a9f24e2d087375ceccebd7008a08ed3733383ee24b3c0

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