Malicious PDF — malware analysis report

Static analysis result for SHA-256 915dbc022c659d6e…

MALICIOUS

PDF

76.7 KB Created: 2021-03-02 05:04:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a5e4c9b516a9ae0bc216b2c11a217629 SHA-1: 671265c76917e8287fa4479444c97fae9f7549e7 SHA-256: 915dbc022c659d6ed9723d9adcb72daf3c36b76655f8380340b51ea8011592b4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://resalured.ru/wix?keyword=harmonic+convergence+2017+lineup PDF link annotation
    • https://cdn.sqhk.co/dasewugiru/EgjByjh/lurunemage.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/sekiratazali.pdfIn PDF document text
    • http://teenagetutor.online/how_to_set_up_scotts_broadcast_spreader12a6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426682/normal_60326649ee25f.pdfIn PDF document text
    • https://cdn.sqhk.co/jewipabefoji/gcHnhgO/electronic_music_for_studying_mp3_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487665/normal_5ff07e847ed60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418985/normal_602314322c026.pdfIn PDF document text
    • http://prizinsta.site/canal_du_midi_cycling_self-_guided408q5.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/QYhagHi/xokoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/jijg5GQ/54498926464.pdfIn PDF document text
    • http://sentytld.online/how_much_is_ps_vita_slim381vi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_6032929164f5e.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/Dw0Cqje/wakuzepaboguko.pdfIn PDF document text
    • http://summ-green.fun/gisesegirz7hbo.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/wupixufekijax/tavozevilutodefozolofol.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/lg_dle2514w_not_drying.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/gana_achu_all_song_masstamilan.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_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 5504 bytes
SHA-256: 7a7c9f750aba4812e255a54ac91fd557787ee6811cc294cd1a09a4e5f5a9e789
font_01_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 10184 bytes
SHA-256: cade976aa3afcd7317918b3a5f4a01b5b472c20d82dd39d0722f1fe81a41237c

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