Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f1a787dc5fff6d…

MALICIOUS

PDF

84.6 KB Created: 2021-05-22 16:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2ab6e7429d33c97779d92961c390f8c9 SHA-1: c0c441d3309ad1511f7c8cdd57c7f997b8ecc515 SHA-256: b5f1a787dc5fff6dcc2e9d36eb471cac9e18a0246ae961bce6fff0b9a63689ca
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://vilenefex.ru/strik?utm_term=holes+anatomy+and+physiology+chapter+10 PDF link annotation
    • https://dogodomob.weebly.com/uploads/1/3/4/0/134017369/rowakanefipiw.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/xexoritijixa_kugew_xujibubuxof.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/2951422.pdfIn PDF document text
    • https://zupagefu.weebly.com/uploads/1/3/1/0/131070313/674524.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/xiwevitox/yahoo_messenger_apk_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/6321851921.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/xekutofobiv.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/22914497396.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/59465126269.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/9730714692.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/smart_wristband_2_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/calvinism_vs_arminianism_does_it_matter.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/38046758205.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/duwibilubi.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/panasonic_viera_tv_remote_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/3335948512.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/cdc_c_diff_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/rodekemireji.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/h2020_coordinators_day_amendments_and_reporting.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_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 5744 bytes
SHA-256: 28007f14acd30c02851042e4adc07b8dbc353a827c797aa430a1558f481cb161
font_01_sfnt_off00011def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 11004 bytes
SHA-256: c29b318d4a2fbd93a2cf6873c609eafcb81cd693fbb78ab030dbe3142b07a054

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