Malicious PDF — malware analysis report

Static analysis result for SHA-256 5953dd701099b1d1…

MALICIOUS

PDF

76.1 KB Created: 2021-03-20 13:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a4e4eb3c65932259f4b0af80f59c7ad3 SHA-1: 2d082a25888e26101be2d0e2ae59d35bec85fc08 SHA-256: 5953dd701099b1d15d28abcea1bf5c6c1bdbc50f16bc3748e3f9bcaebdea68dc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://kuzutuzo.ru/strik?utm_term=evenflo+exersaucer+triple+fun+activity+center+world+explorer+replacement+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5fd8c6b50a222.pdfIn PDF document text
    • http://trysol.xyz/kakogajevogrkn9h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_6027a20297efc.pdfIn PDF document text
    • http://plafond.xyz/25937743910zstpv.pdfIn PDF document text
    • http://elerctum.org/gallstone_guidelinetsxfn.pdfIn PDF document text
    • http://want-seo.ru/winning_slotstm_free_vegas_casino_jackpot_slotsi8qu1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489981/normal_5fdc450de617f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_601e43301148d.pdfIn PDF document text
    • http://keksik24.ru/watojegixo671er.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_6032f8415094f.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/nitirew/79862942654.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/pifudazufa.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/how_to_install_mtx_terminator_tna251_amp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba27bfa1-f8fa-4931-ac77-8ec4c7e2bb93/what_age_is_dork_diaries_appropriate_for.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/aha_guidelines_stroke_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c088646d-8bfa-4aeb-ba5f-8a577fcda97f/demifu.pdfIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_4e2a1d0b2d71477a8180aba6ccbc240b.pdf?index=trueIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_cbeb249c21b4455d9c3b403258879f3f.pdf?index=trueIn 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_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 5580 bytes
SHA-256: c8fb115dd4ba7668f34488172a298175b0fbc16b174402677910b1f4a7e2cdf8
font_01_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 11124 bytes
SHA-256: 3a0c33265c431f420b78ffce1627dbd45dad5ec7bf374806467d0abee0d8874f

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