Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acc74cdf5e376ab…

MALICIOUS

PDF

80.8 KB Created: 2021-03-27 16:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f62e13d032e5d0e972f13f51d213225a SHA-1: 00d9b0bda82238633b304e366df9770f7e050971 SHA-256: 8acc74cdf5e376abb3a1ad5107c507cef992e0b75cc7e2e0670d6f54d76592d3
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or SEO poisoning campaign. The presence of external URIs and the nature of the link farm indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://midufefew.ru/award?keyword=abscesso+periamigdaliano+tratamento+pdf PDF link annotation
    • http://nedaxavipotu.22web.org/purefinijorinusagigufaga.pdfIn PDF document text
    • http://kulapub.22web.org/brothers_in_arms_3_apk_obb_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/hXRjc4F/hnefatafl_rules_11x11.pdfIn PDF document text
    • http://sibutud.22web.org/6_sigma_green_belt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_601ad6c330f73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_5fd1a7e07c081.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/fiiuPyx/96658566386.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/8b38fd4afa4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_605c118a8a359.pdfIn PDF document text
    • https://cdn.sqhk.co/duwokarewesu/gdhdgeD/frisbee_forever_2_download_for_pc.pdfIn PDF document text
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/kuvewivuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_5ff2c0d0c4b97.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/sRgdVBE/22443864040.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavavoju.rf.gd/bed_admission_form_2018_haryana.pdfIn PDF document text
    • http://tidewoxawutose.epizy.com/psychology_intake_form_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b41def5-a8b0-4f40-9db2-3f439e834156/best_way_to_practice_violin_scales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381356de-1f4b-457d-a9cf-3f9ca6e2f052/how_to_replace_carefree_awning_fabric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12438a5f-cf2e-48ba-a2e9-644a23c09687/30812149124.pdfIn PDF document text
    • http://kalogoraretupo.epizy.com/muzavonojubux.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_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 5604 bytes
SHA-256: d14827b3744380fc663ba9691337e0a7bc9f3df86151f48a5fea1efaf8aeb17e
font_01_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 12860 bytes
SHA-256: c11dbdcf9cf5ced76012335a613bc37fb5660e1520653324df12a31bddcb17a4

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