Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdaf89347aaf3f47…

MALICIOUS

PDF

114.5 KB Created: 2021-03-29 11:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d856970df56c1cb82cca9674d014ba31 SHA-1: 2a5348009b93c10d71e6bac9b760ade6b66bd4ef SHA-256: cdaf89347aaf3f478160c062e1981d2428816ae29b0d59a9453b3ef1c743610c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam tactic to distribute malicious content. The primary external URL observed is vilenefex.ru, which is likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=importancia+de+los+costos+de+calidad+pdf
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/9383613.pdf
    • http://mudemofe.iblogger.org/eventide_timefactor_saving_presets.pdf
    • https://jiwosanoxonu.weebly.com/uploads/1/3/5/2/135299962/413792.pdf
    • http://yewes.fun/the_ultimate_gift_by_jim_stovall_free_downloadkwkac.pdf
    • https://bigufoxorifef.weebly.com/uploads/1/3/1/8/131871864/zipedamesu.pdf
    • http://tugrull.com/750640807973xkva.pdf
    • https://xoxopazivufa.weebly.com/uploads/1/3/5/3/135398299/jotakagirufisaba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zedilegol/vafes.pdf
    • http://ledarumita.rf.gd/basic_english_grammar_part_2.pdf
    • https://s3.amazonaws.com/rivazixexuguri/45031939633.pdf
    • https://uploads.strikinglycdn.com/files/bca2a38b-0519-4fc7-ae43-a42f0d634a31/how_to_pair_altec_lansing_speaker_to_iphone.pdf
    • https://uploads.strikinglycdn.com/files/136bb38c-5167-44fc-8ab3-9c5ecc0774f1/international_journal_of_research_in_health_sciences.pdf
    • http://bolomad.epizy.com/investing_all_in_one_for_dummies_review.pdf
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_f3002c84a8684bdf9383fc27e949a2fa.pdf?index=true
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_667d949a5b2945c0a083fdd5a8fe31f5.pdf?index=true
    • https://s3.amazonaws.com/jeponowon/nikon_new_dslr_camera_launch_2019.pdf
    • https://s3.amazonaws.com/dezajok/lazoviti.pdf
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_41a9488339d249829a2745aa909063c9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/72be05c8-9240-4361-a29f-8be4a59b2a89/60156146961.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_off00018286.bin
aa4247d8b62edc9872a838207eaaa9169aa3fe4d92b6522c2ecfa97dbb625f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18286 5236 bytes
font_01_sfnt_off00019438.bin
dd0730e9fe301bba3d4749e9abb877e472baedfbc3e22c3706034f971a44f02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19438 11976 bytes

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