Malicious PDF — malware analysis report

Static analysis result for SHA-256 317bdb941edb8807…

MALICIOUS

PDF

69.4 KB Created: 2021-02-12 17:37:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 55942a7b0a27844ff8b417be3f3952bc SHA-1: 17d3fb6bbe4b8f596e1215268e0ecd3999ae708a SHA-256: 317bdb941edb8807133a1d7fe6c94771107979ef2e545395201c2f3707d5c586
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no direct executable scripts were found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://seumenha.ru/wix?keyword=graphing+complex+numbers+worksheet+answers PDF link annotation
    • http://kamini33.ru/26874770282lg49d.pdfIn PDF document text
    • http://govnososal.xyz/98481462330cpjbn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380211/normal_5ffa07bd48ef6.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/egchijg/heroes_charge_burning_phoenix_6.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/dfe237300079.pdfIn PDF document text
    • http://artistichomesolutions.com/solo_wargaming_guide09uji.pdfIn PDF document text
    • https://radoxawema.weebly.com/uploads/1/3/0/7/130738714/nizagivijepo_titemulaluw.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/5168816.pdfIn PDF document text
    • https://rebigakudaj.weebly.com/uploads/1/3/1/3/131383708/9995048.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/LqjahbW/jodigakivemimetazok.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/hevgchb/cnc_machine_learning.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/desh_bhakti_all_ringtone_free5d3ho.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_60125df466bb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_5fd822a4a5071.pdfIn PDF document text
    • https://cdn.sqhk.co/morexemodoju/HhjiaHR/dream_daddy_hugo_date_3_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/jcH5LYa/brawl_masters_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/ieijcjf/survival_gear_list_for_hunting.pdfIn PDF document text
    • https://sevimuxeso.weebly.com/uploads/1/3/0/7/130739978/bekino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 5740 bytes
SHA-256: 94e3f82a194337cd871da3fc6ebd7f1b7cfdb8ff17854820c6fe938dccb4a609
font_01_sfnt_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 10088 bytes
SHA-256: 208f8bea91e70d1d201a104753150b52a3feded1f4977b7fff8e6a795619de6d

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