Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a15e68d2d7c2e70…

MALICIOUS

PDF

65.9 KB Created: 2021-03-20 21:29:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c091c0cd27c3fc22756317ea875dc2f8 SHA-1: 5acdebe3d06415dbb38613c715b05e6592e531c0 SHA-256: 2a15e68d2d7c2e70fc3156c95e35dec9243672f7abd64f2a1e159726a1b3386b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://gimoguvi.ru/wix?keyword=amana+refrigerator+troubleshooting+manual PDF link annotation
    • http://ayazshabutdinov.club/vuvagipozonetirarakozojeleb1l.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/categorical_data_analysis_3rd_edition_by_alan_agresti.pdfIn PDF document text
    • http://kinokaiff.space/planbook_sharing_lesson_plansoxrh5.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/3mPu5hj/xonuruforabovuxida.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/KrjcOid/baixar_traffic_rider_infinito_2020.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/60041766990.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/GJAhaje/lomus.pdfIn PDF document text
    • https://silixumofabu.weebly.com/uploads/1/3/2/7/132712413/gexomimaraw.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/nomitykj5w.pdfIn PDF document text
    • https://cdn.sqhk.co/zujadibarise/EHhcWu3/wikurijemotifavigetil.pdfIn PDF document text
    • http://copyright-central-media.com/tengan_cuidado_translationt2gdj.pdfIn PDF document text
    • https://dekewojevor.weebly.com/uploads/1/3/4/1/134132084/7090652.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vebusatoro.atwebpages.com/examkrackers_101_passages_in_mcat_verbal_reasoning.pdfIn PDF document text
    • http://sewemira.atwebpages.com/breviario_de_los_politicos.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/10558009294.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_off0000c9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DA 5308 bytes
SHA-256: 06765a670c3715a2fa0dff6658a0c108634b0349a454ad4c8cb50e76962d9aeb
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 9144 bytes
SHA-256: ae5a076ec1b54be30789b195f3e3ee23af83b151dc7bc9e29da7dd8e47f0aaf7

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