Malicious PDF — malware analysis report

Static analysis result for SHA-256 333e5154b66390a2…

MALICIOUS

PDF

89.7 KB Created: 2021-03-01 21:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cb95de507d833082f3be390c234886ed SHA-1: 8b4964cdf8c067ad589cd1b5100cd4b13733c5e2 SHA-256: 333e5154b66390a226687d5b09f1a4c38a809feafc4565b994a18fcc237187ad
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=silhouette+wine+cooler+not+cooling PDF link annotation
    • https://cdn.sqhk.co/kuniremolu/ijhKhdO/98415678183.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/85203652456.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/jhU1Oic/celebrity_cruises_alaska_excursions_brochure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_6013ea08c4c91.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/bubikedegutokonimopanisa.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/gjgO1hj/stick_cricket_premier_league_uptodown.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/singapore_math_syllabus_kindergarten.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/ramotogarunasitozoxok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489412/normal_6024ed8ddb844.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/rXH1yhf/muzogasafelarevim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531626/normal_5fde35703e000.pdfIn PDF document text
    • https://cdn.sqhk.co/moxawitab/Mglhfgf/xijawulejewipozisinimakik.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/gjiHjdj/pibasidaruzubaxubijozolar.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/pavefivaruwifutivimak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_60203ff00f18d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/badodemebo/office_closed_for_labor_day_sign_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 4748 bytes
SHA-256: 7cf6e3038fbc73d6667839e8b991ac58a677192336ea9137556de6dec2b68416
font_01_sfnt_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 11312 bytes
SHA-256: 7310ea86e7b1daa00299454ec6c6bb26f56a4364fcf0e8fa3d10d5be4189eabc
font_02_sfnt_off00014b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B11 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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