Malicious PDF — malware analysis report

Static analysis result for SHA-256 940ca9da6ffa205a…

MALICIOUS

PDF

75.3 KB Created: 2021-03-18 00:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0313f31b27a0b697d0217951113b5869 SHA-1: 522681c1453940ba9406b0f739fae7bb5496a998 SHA-256: 940ca9da6ffa205a70c20bed75bd7a9cfc444e299e8e130dcc422761e6e05d4e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF that contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs, including those with 'utm_term' parameters, points towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://jottigo.ru/123?utm_term=high+gloss+finish+sheet+vinyl PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465556/normal_5fcb9c3c5be2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486350/normal_603714132ee21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_6049bc496649f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465389/normal_60288f64bbe4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_600cde2fcaa77.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/rjb04je/99895791972.pdfIn PDF document text
    • http://purumobakeleju.22web.org/json_convert_deserialize_object_c_example.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/egf6igm/walanazefigegememobo.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/crSgejf/tixugarivoxepobapo.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/whirlpool_duet_washer_error_codes_e1_f3.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/juzulolapidivusoku.pdfIn PDF document text
    • http://xevojifixifepi.scienceontheweb.net/apex_code_developer_s_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wemojezuvegi/hjhihgy/guide_for_among_us_ultimate_strategy.pdfIn PDF document text
    • http://nanebaxexob.getenjoyment.net/mubifinodanufexajalifinuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wajiletum.epizy.com/gijavetazobe.pdfIn PDF document text
    • http://puredaw.rf.gd/51914695611.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_7e7745a02b2e4102940d46cc7fff2c90.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_db30abc1897d47ab93029d73d8ee4acd.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_fb5813f511f1451ca6420de219b5816d.pdf?index=trueIn PDF document text
    • http://kaloruligot.onlinewebshop.net/139_bus_schedule_nj_transit.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_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 4844 bytes
SHA-256: 85b2168f8a4afe95b1d94ca54f2ed0a19e611286724056a5e9e33f79b393cacb
font_01_sfnt_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 10676 bytes
SHA-256: 3aa5ebf1c53bd229db9cbd91e4f3ae41f18976933f41e9b4d63647225a330158

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