Malicious PDF — malware analysis report

Static analysis result for SHA-256 445c319dc7e5bd93…

MALICIOUS

PDF

73.4 KB Created: 2021-03-22 21:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3ead2dccf8c041b2cdfc85f67ad64129 SHA-1: eff4063ef26173ade86cf7f4603cbd712b7a4811 SHA-256: 445c319dc7e5bd93c51783ba78b652c81bbbce42e5012dad52541812ad1a83fb
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the document is designed to redirect users to potentially harmful external 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://leonvi.ru/award?keyword=variable+displacement+axial+piston+pump+pdf PDF link annotation
    • http://azakalaza3.xyz/1441316940rgjmb.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/lunomekelunajo.pdfIn PDF document text
    • https://sagotudiwesuw.weebly.com/uploads/1/3/4/3/134340488/dovazupe-sibewapimuw.pdfIn PDF document text
    • http://smartcreditcheck.info/blades_of_brim_mod_apk_updated_versionzujbi.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/irrigation_engineering.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/genona.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/pjaheRz/samsung_high_volume_ringtone_free_download.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/wezebapoxewebur.pdfIn PDF document text
    • http://lakcherie.ru/973801829271n2cx.pdfIn PDF document text
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/rijijizagatopap-petawobenarumed-vokakebu.pdfIn PDF document text
    • http://snegny.com/army_mdmp_manualnm2ru.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/hcidjec/overkill_3_game.pdfIn PDF document text
    • https://dorixakogika.weebly.com/uploads/1/3/6/0/136051108/765c943f7c760.pdfIn PDF document text
    • https://mobonojijokatu.weebly.com/uploads/1/3/4/3/134320628/nadomipadixaduxuvuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/zamepeja/hhdhgia/99785353826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pasufok.rf.gd/appalachian_trail_hiking_guide_book.pdfIn PDF document text
    • http://bejuxufuvojofa.rf.gd/nekevezalurawekijosed.pdfIn PDF document text
    • http://vitupofelomar.epizy.com/tubemate_cracked_apk.pdfIn PDF document text
    • http://sefowolo.atwebpages.com/71780381230.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_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 5472 bytes
SHA-256: 76624a26c35059182b3754d54bed9324a2d6c54b7afd92caf7ce74a0d8199fcb
font_01_sfnt_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 10636 bytes
SHA-256: ead0ebaedd1eddebfcae4ab0ef00bcbe8b39f809d6de41d5efed9f7ef5f4f3ef

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