Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5610714a6528268…

MALICIOUS

PDF

91.5 KB Created: 2021-04-21 11:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03d8053ddc8e47f830b13ac2bd6ec783 SHA-1: d02622a3510c53a8b5a0862dd15ff334075cc107 SHA-256: e5610714a652826842badb3d9e71892b55e33faec7ddc782ed3714b66eb62b71
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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://pelibifir.ru/strik?utm_term=psychological+assessment+resources+glassdoor
    • https://cdn-cms.f-static.net/uploads/4443344/normal_6055be03b4fc5.pdf
    • https://cdn.sqhk.co/butiluluvuk/jbLGheE/9909053601.pdf
    • https://zewalomoweso.weebly.com/uploads/1/3/4/5/134588134/ae3bc8.pdf
    • https://cdn.sqhk.co/votezevon/heFgjhh/fogaxuwukudejujetudenugo.pdf
    • https://cdn-cms.f-static.net/uploads/4369336/normal_6034396bc04c5.pdf
    • https://cdn.sqhk.co/nejibija/geggja3/chemical_nitrogen_fixation.pdf
    • https://static.s123-cdn-static.com/uploads/4410983/normal_5ffb74470ddc3.pdf
    • https://cdn-cms.f-static.net/uploads/4485152/normal_605153af9944b.pdf
    • https://jisasulozif.weebly.com/uploads/1/3/4/3/134371627/kogigigusonu_motuj_piditixemitaw.pdf
    • https://cdn.sqhk.co/tireronerogo/YOBzieB/83800112870.pdf
    • https://cdn.sqhk.co/gasidonoda/VghLngj/93018176534.pdf
    • https://tedozumezefa.weebly.com/uploads/1/3/2/7/132740670/59ff07c67a3c43.pdf
    • https://static.s123-cdn-static.com/uploads/4387582/normal_5fca8b63891b4.pdf
    • https://cdn.sqhk.co/kisesawaropo/jqshahj/61910220360.pdf
    • http://show-visitor.xyz/bbc_russian_learning_english_podcast_transcriptjzbgz.pdf
    • http://blu-ital.space/maths_frameworking_3.3_answers9ed73.pdf
    • https://xoxumowuna.weebly.com/uploads/1/3/5/9/135964844/pezakuxup-paganurozozas-barubitun.pdf
    • http://siankaanmexico.com/cuisinart_coffee_maker_burr_grind_and_brew_troubleshootingkwbpt.pdf
    • http://lnstagram-blue-badge-form.com/stick_fighter_animation_online7t7fd.pdf
    • https://cdn.sqhk.co/wagomito/atchg9t/16351793237.pdf
    • http://igcopyrightforhelps.com/delta_crib_conversion_to_toddler_bedyb00q.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0001291d.bin
33958037a9edd1ef812f51ebdbe402b807a567b88223fed66c4b9427a5908482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1291D 5456 bytes
font_01_sfnt_off00013b85.bin
cb4fd66578c2103292f5dae58f36b5952fc5effd3f3ea1f568e434ee9eafbc16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B85 11204 bytes

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