Malicious PDF — malware analysis report

Static analysis result for SHA-256 3505c65920053e2a…

MALICIOUS

PDF

72.3 KB Created: 2021-02-25 15:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: bc5d2bc89aa6d7f4e3b6db021bad2e82 SHA-1: 9a35da7df7366b39bfbc8d740bdd79950b064c6a SHA-256: 3505c65920053e2a8d1094f8289a64c82eb002cfb28180ffb02adf143a12cdd6
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://jacksth.ru/aws?utm_term=how+to+remove+bathroom+sink+faucet+aerator PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486353/normal_5ff538ddb3371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473638/normal_5febb23031651.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366360/normal_5fe2764b581d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419430/normal_5ff30485d1c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_600e5c636de20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_602062d0de687.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/5992070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415937/normal_5ff7d739efde7.pdfIn PDF document text
    • https://lufowatevumidoj.weebly.com/uploads/1/3/4/7/134704320/7c2556.pdfIn PDF document text
    • https://sugelazo.weebly.com/uploads/1/3/4/7/134767002/46bda9dd42414.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387562/normal_5fc924a163c13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_6020d5278c62b.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/dusubonifu/bureau_s_concrete_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/baedeker_guide_books.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/best_tricep_dip_form.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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 5404 bytes
SHA-256: f529ba91848aebdc26eb6199aed3e5abb11bf233859571639fe8ae6916fbdaeb
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 11088 bytes
SHA-256: 9b7194f3b389a4b3ba3a88b2fe3c3cd6ab73d601136aa5f874bf4182386b575a