Malicious PDF — malware analysis report

Static analysis result for SHA-256 557fffec36abaaf1…

MALICIOUS

PDF

72.0 KB Created: 2021-02-14 18:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ae12eaa3207454e57f66405d433913d0 SHA-1: 44623a0c2f3656db80c6ebc1de64ceec54a7cc78 SHA-256: 557fffec36abaaf1d2fbdd641b08e5abd6125857b5129479ebec8e190755cf33
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to sites hosting malware or phishing content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=descriptive+statistics+worksheet+pdf PDF link annotation
    • http://hookup153.online/vawibabomamojuzinasen2pn4.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/31c599a61.pdfIn PDF document text
    • http://itravelgr.com/icao_doc_9774_manual_on_certification_of_aerodromesovyoe.pdfIn PDF document text
    • http://nunegotopexipo.iblogger.org/spotify_pc_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413978/normal_5fde6e897a9bc.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/9769910.pdfIn PDF document text
    • http://kernig.store/writing_idiomatic_pythonutona.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/67114937536ktz7e.pdfIn PDF document text
    • http://oneitshop.info/82210113260txb8q.pdfIn PDF document text
    • http://vigastlens.xyz/91640397661d244o.pdfIn PDF document text
    • http://prequester.online/77925424895nh60e.pdfIn PDF document text
    • http://ita-fitness.fun/832910080165cnwb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawozovikoruros.rf.gd/99_names_of_allah_free.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 5424 bytes
SHA-256: 166c6da7fb8525e8af94b9c599f4e730e7eb23d40ebfdc41026e0f7b7f291f3c
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 10260 bytes
SHA-256: a5469f48af2255adcb7133e7173104b9de22b60e29847e98a8237106b80544ad

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