Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1e490019dc3ee1…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 06:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd31261ebbcf0619a1653fc763f4ab3a SHA-1: 7ae95808edf82c825527ac7a5adbadeb59541e16 SHA-256: 1a1e490019dc3ee121f3fecd8e7ee9a570540f4eff2afd6559483b430f1a6208
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=ap+style+guide+titles
    • http://zogometemo.sportsontheweb.net/21638847674.pdf
    • https://cdn-cms.f-static.net/uploads/4421464/normal_602b5b0b5bbad.pdf
    • http://avit0.cc/30195097443dwory.pdf
    • http://tejidirexe.mywebcommunity.org/11028258475.pdf
    • https://static.s123-cdn-static.com/uploads/4478669/normal_600975ed7e97d.pdf
    • http://lorewipa.scienceontheweb.net/netipowunezi.pdf
    • http://leqqurint.online/sound_effects_appqw7cy.pdf
    • http://shtangelkipokupkiitd.online/25125500171b3ewc.pdf
    • http://doxedisipi.scienceontheweb.net/handball_bundesliga_spielplan_18_19.pdf
    • https://cdn-cms.f-static.net/uploads/4422372/normal_602888d4b7d9b.pdf
    • http://itwow.info/how_much_does_a_jersey_mikes_franchise_owner_make1oaw5.pdf
    • https://cdn-cms.f-static.net/uploads/4389384/normal_600d6118ca254.pdf
    • http://mitutepoka.medianewsonline.com/how_to_charge_black_and_decker_drill_battery.pdf
    • https://cdn-cms.f-static.net/uploads/4452594/normal_603d0085d4e4f.pdf
    • http://xobilosusi.sportsontheweb.net/incremental_cash_flow_analysis.pdf
    • http://sandiego-podcasts.com/43269418793vg9pi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jifesu/minority_report_brief_summary.pdf
    • https://uploads.strikinglycdn.com/files/1ff389b8-3711-44b7-b0ed-fa376b66e2b0/niboda.pdf
    • http://mugazukadum.onlinewebshop.net/laboratory_apparatus_and_uses.pdf
    • https://s3.amazonaws.com/jenagubadopi/pazuliwajikifofipowogif.pdf
    • https://uploads.strikinglycdn.com/files/a0d5e737-a1a9-4397-8333-ec6a3c5cca01/graco_x7_parts.pdf
    • https://s3.amazonaws.com/nimuwet/swinging_safari_full_movie_free.pdf
    • https://s3.amazonaws.com/guvovigo/26285940880.pdf
    • https://s3.amazonaws.com/penale/29163310109.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_off0000f49d.bin
1136b99dd802f37b5e07e45ab69ab2b77842a739895ec967a18d701db4accd6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 4912 bytes
font_01_sfnt_off00010576.bin
54902e5b8fcf1430fc7b8425738d27324bd31f78ea287d04c3db6ed23dd2fe12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 10860 bytes

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