Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6b0cc97f7190bb…

MALICIOUS

PDF

69.4 KB Created: 2020-11-11 13:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ffadf59499e5e4289c9d8de5a78b8693 SHA-1: 86b422506ccd4e03afe2f11ede8f42da880a2184 SHA-256: 9a6b0cc97f7190bbeb3e26d83657f39c29f7ef43cc5eeeeea43c9ef9784d7c25
254 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious or SEO-manipulated content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://traffine.ru/strik?keyword=windows+7+ultimate+sp1+x64 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_5f8ffe625d80c.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/biguxijajojaril.pdfIn PDF document text
    • https://tolazekujulom.weebly.com/uploads/1/3/4/6/134668849/dowunugale_xawuvifuzivita_gixotuzepodaluf_zejujupuluno.pdfIn PDF document text
    • https://wogijelagorezu.weebly.com/uploads/1/3/4/0/134096035/5104956.pdfIn PDF document text
    • https://sulajaxa.weebly.com/uploads/1/3/4/3/134362611/05e4303b9dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/pathfinder_npc_pawns.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/career_counseling_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/mazugezijap/sims_4_mobile_download_apk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/bazukivukupulekitovama.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/zadoguber.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/the_prince_of_los_cocuyos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAD 5556 bytes
SHA-256: 79301e8902dc34ef4f0c12cb226d10ba0d68608e10ab5231a60aec5de1dbbad5
font_01_sfnt_off0000ceb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB0 10764 bytes
SHA-256: c6e67e54a2082a3c20a729cea0c0e6783aa15035bdd7bb93ee3d0703cd16f825
font_02_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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