Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba03c7d364b6bc9f…

MALICIOUS

PDF

77.8 KB Created: 2021-02-25 01:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c025bb015c5e9891f039eb69675fc8f0 SHA-1: 3cac9819d4efccb2f1cfe87de89a38486346c15b SHA-256: ba03c7d364b6bc9f215a120102e11bb9d5c4676bbb72108b1530b0667b20ad7b
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards a phishing or redirection scheme.

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://druttle.ru/wix?keyword=what+makes+you+happy+in+life+yahoo+answers PDF link annotation
    • https://tigewatujuw.weebly.com/uploads/1/3/0/7/130738543/5854869.pdfIn PDF document text
    • https://cdn.sqhk.co/wozovege/gligpgd/world_war_z_game_new_zombie.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/tabuzalotibonemuxa.pdfIn PDF document text
    • https://ponebivilu.weebly.com/uploads/1/3/4/5/134505494/latakawiguretalirof.pdfIn PDF document text
    • http://umniashka.ru/29711060347n72g1.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/hcjhgjW/nigeragivedefoburusawubol.pdfIn PDF document text
    • https://lifefoxametuzov.weebly.com/uploads/1/3/1/3/131383893/8dc4c7d144699d.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/ieharFN/26718683998.pdfIn PDF document text
    • https://nelurorinubix.weebly.com/uploads/1/3/1/3/131384252/9198089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416810/normal_5fded6e09867d.pdfIn PDF document text
    • https://fujareke.weebly.com/uploads/1/3/5/3/135391043/zifeji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409256/normal_5fff0911e53af.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/kesunowawilubupumo.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/6748545.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/kudefem/53527331799.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_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 5412 bytes
SHA-256: 1696991fe8ca392ccbf67c290cd7cc557433a97ad0c044e08360b987691eb623
font_01_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 10692 bytes
SHA-256: bc0bec710554726e949b1808792d6c2602a41259f74246fc4ddf48ad38298311

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