Malicious PDF — malware analysis report

Static analysis result for SHA-256 64589ccb915f5a09…

MALICIOUS

PDF

82.9 KB Created: 2021-02-17 18:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: c4fcad58aab64daa2ca7ed606d4da352 SHA-1: 11bdb8f1ecbf089a68329c6503cdd7707db6f9f8 SHA-256: 64589ccb915f5a09033d405f0b63c48043d1d1f48a50ea233d6ebb7d8c30e99f
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://maypoin.ru/strik?utm_term=how+do+men%2527s+sheds+work PDF link annotation
    • https://cdn.sqhk.co/novozefox/c4OQIww/65909835854.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374022/normal_5ff2835da8779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417137/normal_6002e1bd6d5d0.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/iVMicje/84952301501.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476590/normal_600654a68abae.pdfIn PDF document text
    • http://mademupo.22web.org/matrigel_tube_formation_assay.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/WnKjf8y/91402666396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489994/normal_5ffec3667f333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5fd74100afc01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382004/normal_5fe5b2516c87f.pdfIn PDF document text
    • https://nufawufaza.weebly.com/uploads/1/3/0/7/130740177/gunopit-taporibij-motimenujole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_5fd0b04322543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://budibebolimuxo.rf.gd/functional_requirements_of_hospital_management_system.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/aasm_guidelines_for_scoring_hypopneas.pdfIn PDF document text
    • http://wobemiko.epizy.com/holzma_cadmatic_4._0.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_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 4976 bytes
SHA-256: 2788db27ec80818b8f5833c7a1f98af86f60e90385e13582cb4b84e513b88a5e
font_01_sfnt_off00011897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 11624 bytes
SHA-256: a8b4bc442f80544f33aeb168d6e4da3c2836d395bad923fe17a583ce40e298f7