Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f5d8ebceb09e8b…

MALICIOUS

PDF

72.4 KB Created: 2021-02-07 01:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 9c88dd26a40e9a47cf0df332091c7563 SHA-1: 6a5169976503cbda004c4ebd6730bcc9a1815f9b SHA-256: b2f5d8ebceb09e8bf09e5231b7f1f1424e49d2061cfb37fd927a4cf87f1340e8
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=online+jobs+yahoo+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455883/normal_600540fe525bc.pdfIn PDF document text
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/tubudufof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486344/normal_60195a641b71a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_6018737ac3280.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5fed808347df7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412896/normal_5ff7642e1cb0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489052/normal_5ffdb32b0bc5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_600d044eeaf38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_5fe6fb618112f.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/4SkW8db/absorption_rate_meaning_in_chinese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5fc5f35846add.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374013/normal_5ffdd41213f43.pdfIn PDF document text
    • https://foramifetutimif.weebly.com/uploads/1/3/5/3/135347605/16b89b6fa4bb8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_5fda96de8dd6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_601f27c68bf18.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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 5208 bytes
SHA-256: 5a7cecdd42da290bfd762edccc6a8edaf2793e0a625baaf8a3678ed67c0fefed
font_01_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 10516 bytes
SHA-256: eacc49706c457da2fda98658fdd79165ceda9bd95c5dac865083014e9409c6df

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