Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f9bb699add7c44…

MALICIOUS

PDF

83.0 KB Created: 2021-06-06 12:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efb2bf0d066d4fc724fa40ee60c1eb48 SHA-1: 7840ab0cebb39ee2649c7ec575fcfe584b0366d1 SHA-256: 54f9bb699add7c444f6a55025ea05a4c596681e86714f9ed26bc2e682ad040ff
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://inwebjor.ru/pbw?utm_term=free+blank+lesson+plan+template+pdf
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fdb939702727.pdf
    • https://nozoxajomakod.weebly.com/uploads/1/3/5/3/135332829/902a942a7b.pdf
    • https://zexosupalagal.weebly.com/uploads/1/3/4/8/134887224/runuwefovaxa.pdf
    • https://static.s123-cdn-static.com/uploads/4368224/normal_5fcdaa128656f.pdf
    • https://cdn-cms.f-static.net/uploads/4420245/normal_6062c4da9f5da.pdf
    • https://gizipiwiro.weebly.com/uploads/1/3/1/4/131454158/tokopoz-xadamun.pdf
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/pixegerilos.pdf
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/7008459.pdf
    • https://cdn-cms.f-static.net/uploads/4421983/normal_6012097cc5230.pdf
    • https://bivajegozu.weebly.com/uploads/1/3/4/5/134598736/79ade251e342d.pdf
    • https://static.s123-cdn-static.com/uploads/4379048/normal_5fddf67217270.pdf
    • https://tazeviguso.weebly.com/uploads/1/3/4/3/134339516/wibatofufezujolusabo.pdf
    • https://wifaborasumekig.weebly.com/uploads/1/3/2/6/132695644/978537.pdf
    • https://static.s123-cdn-static.com/uploads/4408464/normal_60055a232a2f2.pdf
    • https://cdn-cms.f-static.net/uploads/4489596/normal_6036d9be7728e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wepoline.pbworks.com/w/file/fetch/144464322/ielts_writing_practice_material.pdf
    • http://wekibivu.pbworks.com/w/file/fetch/144449682/download_root_apk_for_android_8.1.0.pdf
    • http://lopofemusun.pbworks.com/f/cara_install_game_guardian_root.pdf
    • http://vananizi.pbworks.com/w/file/fetch/144497328/83882819182.pdf
    • http://demopefo.pbworks.com/w/file/fetch/144528357/why_my_pressure_washer_isnt_working.pdf
    • http://dejimebez.pbworks.com/w/file/fetch/144620727/24399913092.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107aa.bin
d1e2cc1b540a6108d156ef6c077988bded34c233e059b6daee787ae0a13e716b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 5348 bytes
font_01_sfnt_off000119c0.bin
df99422f9effef74fbbc3a309325788e203528cd0c56b172492f3670954c8206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 10688 bytes

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