Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd908430b3eb2734…

MALICIOUS

PDF

75.5 KB Created: 2021-04-25 03:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: eebf88c94780e058148be9948bab911b SHA-1: 220fffcbc89df975806a45336135f7708ef7be71 SHA-256: cd908430b3eb27340c9b5ac204e046aabf55b92b59960473dfcccfe005fc49b0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://dugedepap.ru/strik?utm_term=how+to+add+foxit+reader+as+a+printer PDF link annotation
    • https://cdn.sqhk.co/mewowoji/24hghfj/78243994652.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzewekafan/HVgjQii/angular_js_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/pixanetu/jagdjc8/4255827308.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/Ssgf9hd/twisted_together_knotty_crossword_puzzle_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/wodigajamu/91ihhN8/fallout_76_melee_build_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/lakarejof/ethbnEE/gemofenuvakoruzilimowowo.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/hhjdhaf/50963415440.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/iKegQnB/pastel_avatar_magical_pastel_dress_up_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_604eaf6fa33de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5ffc7f2797dd7.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/fosalizuzu/99911176245.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/lentiform_nucleus_thalamus.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_4a57fcc60b9d4a929a2abedc66d4d529.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_b87aa786944448ca8b024d2a9aa5d118.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/astrocytoma_glioblastoma_multiforme.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/lerapogenaze.pdfIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_b73a8a9b815a4e749be8c1b41bdc4549.pdf?index=trueIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_66b2b49b66f847a69b45a008ede7e35f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujesulad/marantz_sr5008_n1b_7.1_av_receiver.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 5124 bytes
SHA-256: 7a7b64ed0fca52952f45b1c0676119bf3fdd9957ca3412da737111f0605af630
font_01_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 11188 bytes
SHA-256: dcbb87640e1d6b00ece440ad7398feb6d5c36c5d168aace5f25550fb2494b688

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