Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5ea80480ea18ba…

MALICIOUS

PDF

76.2 KB Created: 2021-02-22 23:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8a99618ec19e1732bcb94c06c0281b40 SHA-1: bc85331ff9ef99fbd2554bf911c745a41d7b6e3a SHA-256: 5d5ea80480ea18ba47790abc213edc9580cb352f63b9d72f8e64bdabced9e269
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

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 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://baarspo.ru/strik?utm_term=what+causes+divergent+boundaries+to+move PDF link annotation
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/be8b843b5d86.pdfIn PDF document text
    • http://medicalpracticementor.com/patent_search_analysis_report_psar_11j2n6.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/53937114473ltmlg.pdfIn PDF document text
    • http://legendbilisim.com/bass_guitar_chords_free0y3d0.pdfIn PDF document text
    • http://rakajipof.22web.org/python_2._7._4.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/ehi0hhK/woodturning_lathe_chucks_for_sale.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/49449529763825mq.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/portugus_de_portugal_para_estrangeirosw36yu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5fd280774c849.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/dowipawesubefa_roberuxexowegej.pdfIn PDF document text
    • http://4gusevshop.space/secureye_access_control_system_softwarep0vpp.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/6jhMEPf/us_military_conflicts_timeline.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_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 5536 bytes
SHA-256: ece1905e419c21cf9c7ddf124de56233a82365e803d0701480bc81602503a4b6
font_01_sfnt_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 11024 bytes
SHA-256: bd7d5c3dea17fd48bab7df2d31b6fc26aaf822af75f008b5905ce971ff15f067

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