Malicious PDF — malware analysis report

Static analysis result for SHA-256 694a8f0c975263ea…

MALICIOUS

PDF

76.9 KB Created: 2021-04-14 17:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c111bb490624db752c5fd83f4344f429 SHA-1: 2744d4a08da19f81a0bcfa80aff4258149f3509d SHA-256: 694a8f0c975263ea33a6f4223b0247c154e55e7fbebd386160d5babd28c33737
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host multiple links on disposable domains, a common tactic for phishing or malware distribution. The presence of numerous external URIs, including one pointing to 'zajinet.ru', further supports this. No scripts were extracted, but the overall structure and heuristics suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/strik?utm_term=lifesmart+hot+tub+ls600dx PDF link annotation
    • http://lonemap.medianewsonline.com/funza_lushaka_bursary_form.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/GjgZSMe/lotuzisaz.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/lokadowaxifozezilopekuxo.pdfIn PDF document text
    • http://dektesheff.xyz/tirunuluwawesajimipivazmwvhw.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/hhG6hbi/57582713645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413008/normal_5ff21e8061ef8.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/90209280355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_60388703af9e3.pdfIn PDF document text
    • http://wurilozi.scienceontheweb.net/significado_de_los_meses_hebreos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376600/normal_6006bf2827f60.pdfIn PDF document text
    • http://centerverifybadge.com/fematamotimaletareweklgac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5fc7cb677fdc1.pdfIn PDF document text
    • http://salestore.pro/listening_practice_through_dictation_google_drivejiv2t.pdfIn PDF document text
    • https://cdn.sqhk.co/satijumok/cxpjdhd/red_vs_blue_state_map_2020.pdfIn PDF document text
    • http://trend-sales.fun/32431739264io9ax.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/29264758876.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/eKXJehi/ates_ve_su_oyunlar_2_kisilik_ucretsiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_221ec60880624488b375c40ed24a9490.pdf?index=trueIn PDF document text
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_8a0d935bcb384e16bd7d6a882b7f3620.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_cdb367420ca0483a98bf56f569e99765.pdf?index=trueIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_5c444555a9434b9197bf82b5552f808f.pdf?index=trueIn PDF document text
    • http://butorinowu.myartsonline.com/how_to_get_a_job_in_network_marketing.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_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 5592 bytes
SHA-256: 08e761abcf525e641480259a6cc305b2cde5e89a8d5c8c8bd2d844d784089bd2
font_01_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 10996 bytes
SHA-256: c23a8d26a18cab773733bd299685fdde934a912ebfa1e7aebbb371bf87fdd463