Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb67dca817accf7…

MALICIOUS

PDF

72.5 KB Created: 2021-02-21 23:24:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5938cb716681ad8c2b037759ea4eff56 SHA-1: d44b87cd95f6c52e2f678b90bd582c66df511bed SHA-256: edb67dca817accf72193b81b8085293352228c67e1f7676920fde7dbf4c1edc0
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 0.9997

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://seumenha.ru/strik?utm_term=salem%2527s+lot+remake+2021 PDF link annotation
    • https://cdn.sqhk.co/xefijumu/Db7gdjj/trainheroic_cancel_membership.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/oghgigf/77698535394.pdfIn PDF document text
    • https://levunabul.weebly.com/uploads/1/3/1/4/131407164/2bdb24.pdfIn PDF document text
    • http://okclub.org/what_is_a_dapple_dachshund_mixed_withwv0jf.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/2icicOR/54799759483.pdfIn PDF document text
    • https://lotekovikerux.weebly.com/uploads/1/3/1/3/131398560/89e219.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/WLMigQs/zalalenokixudeteden.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/hcEjiNY/90662208943.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/h4hbmNc/toca_pet_doctor_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/wZFhgif/bunny_running_and_jumping.pdfIn PDF document text
    • http://gmetry.online/duck_hunter_gamerys14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tewidunutazi.rf.gd/85761154070.pdfIn PDF document text
    • http://zadagudigewe.rf.gd/vovevarobaxafa.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/evenflo_car_seat_install.pdfIn PDF document text
    • http://wogurep.epizy.com/bioelectric_potential.pdfIn PDF document text
    • http://sisawujeza.rf.gd/54035721627.pdfIn PDF document text
    • http://girinuluzu.rf.gd/cysteine_proteases.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_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 5360 bytes
SHA-256: 61a5c9968a13b90c3e2ac25641e07fafa1b5301f4bb79cbc64ebb67c655e70fc
font_01_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 10652 bytes
SHA-256: 0894440840c51e8877e36c7703fb4439c7b5a6fbe58780497f5d79543e98fa4c

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