Malicious PDF — malware analysis report

Static analysis result for SHA-256 da937cd343147572…

MALICIOUS

PDF

71.2 KB Created: 2021-03-02 16:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 8996d30a2139b29f0d58e445b94f1445 SHA-1: 7145f7f405dc4230c88296cdd97aec0adde966a3 SHA-256: da937cd3431475722390d883c28c5a11fc99aec42a88f41c9a2d2e30b2081db8
196 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xajibur.ru/award?keyword=the+didache+text+translation+analysis+and+commentary PDF link annotation
    • http://jevebolutu.iblogger.org/39681128542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498883/normal_6029dfef47e80.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/cgjjdiM/online_barber_appointment_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_60301577ed1fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5fec6a44bb850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452152/normal_601cdecfe1951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480393/normal_5fe15fe4a29ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459630/normal_6002ad0d8d310.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/what_is_a_good_wrist_blood_pressure_cuff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501380/normal_600878f7bfc80.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8r1MRHy/siwibefotiduxidudenafomen.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/bekavivimezax-mofuza-sabuseju-xobasagiwikeji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuxobubuwuvivil.epizy.com/49802491815.pdfIn PDF document text
    • http://xarifilaf.rf.gd/cortex_journal_submission_guidelines.pdfIn PDF document text
    • http://xisutep.rf.gd/dr._jekyll_and_mr._hyde_sparknotes.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_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 5300 bytes
SHA-256: d45d0ea430c6a2bcf79c55328d232166fb9a2c0d04ea323535d8288d6154b2b7
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 10108 bytes
SHA-256: 8d21c1d2aa31830c93a6d1b005b5b47ed2db0738e1c0eab61776276dd6b033d8

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