Malicious PDF — malware analysis report

Static analysis result for SHA-256 8635668e20c1f70b…

MALICIOUS

PDF

71.4 KB Created: 2021-03-18 17:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23067857154a6e7b3d80ffa6161f747c SHA-1: d6171705a27d9c8996d1fa1804d8887f5ddb622b SHA-256: 8635668e20c1f70b38c24a8a6248c012b28975bcedeed52c9d4b8d62ff534bb4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on suspicious domains and are likely part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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/award?keyword=canticle+of+the+sun+chords+pdf
    • https://kapexuzavum.weebly.com/uploads/1/3/4/6/134691047/4928822.pdf
    • http://antileqphh.site/wabuxitidonujegadufafotakfz48z.pdf
    • http://insuranceautousa.com/niwegoloxidojamahvtv9.pdf
    • http://geesecam.com/vipomasiwfeqii.pdf
    • http://damita.fun/ejercicios_de_notacin_cientfica_suma_y_restaxvxds.pdf
    • http://confirmationhelpcenter.com/liste_des_comptes_du_plan_comptablesz6u8.pdf
    • https://tojumofudino.weebly.com/uploads/1/3/2/6/132681199/02ace.pdf
    • https://vosewisujar.weebly.com/uploads/1/3/5/3/135398140/3ddd1090.pdf
    • http://8gusevshop.space/cute_pink_owl_wallpaper_for_iphonekkqfz.pdf
    • http://rcasino.info/68427015762z4nb9.pdf
    • http://gratoraama.space/kepoviserereh1v9q.pdf
    • http://fkpravo.ru/xilupawinoxzs2ym.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/viboxikuz/wheels_on_meals_soundtrack.pdf
    • https://s3.amazonaws.com/libeganot/matuxuxesexoxod.pdf
    • https://b3159766-6c8b-4733-a97d-e59ef6783693.filesusr.com/ugd/21851e_3022d8d2183a424993e5401cff671ba6.pdf?index=true
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_1d2640f8bf424042a00c929548673366.pdf?index=true
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_ff9b1060137546afa4819ab4a429d021.pdf?index=true
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_cc407362cdc644e4beac7735d1a2e6dd.pdf?index=true
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_53baaedb98ac4a6dbb32c6f38c621b58.pdf?index=true
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_8a7c266cc8214774ac6e345c937727f3.pdf?index=true
    • 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_off0000da11.bin
3fb4a792b99ed46a7e76f7345a02da3dbfed2da8fa053b4118f578e36a7cc382		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 5148 bytes
font_01_sfnt_off0000eb8b.bin
3bd8f9b57408eb09a3f8012e8aa917537fa00e54c4dacd15dfbab29cd5796933		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 10348 bytes

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