Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16bc562cbaa16ee…

MALICIOUS

PDF

73.2 KB Created: 2021-03-19 08:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 41b3fc74034f66e046a9f5a4a4b32870 SHA-1: 136c2f74c45a9966d5db440daa673212f07b101d SHA-256: d16bc562cbaa16ee3d072e471d2aa2bdaf93a8dc1e0dc36840beaaa0f0c32461
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://bologen.ru/wix?keyword=mass-volume+problems+worksheet+answers PDF link annotation
    • http://bomaduworofa.medianewsonline.com/25847592103.pdfIn PDF document text
    • http://fokojudup.22web.org/exercice_d_alphabtisation_pour_adultes.pdfIn PDF document text
    • http://gunenekaroz.mypressonline.com/impetigo_bullosa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5ff4328cba2f4.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/how_old_is_my_sw_38_special.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470019/normal_5fcd87e493876.pdfIn PDF document text
    • https://cdn.sqhk.co/marivefigus/theicib/78395622230.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/liftmaster_motion_sensor_light_not_working.pdfIn PDF document text
    • http://felidefewipikig.22web.org/75083968277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_5fe9ae57120a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408598/normal_60306ece6fccf.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/jQnichi/vejamutikarekekux.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/make_google_search_homepage.pdfIn PDF document text
    • http://lanizimugigil.getenjoyment.net/bsnl_prepaid_plans_up_west.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393209/normal_600483b4dbfbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonezitugomal.rf.gd/que_significa_lder_autoritario.pdfIn PDF document text
    • http://kejiguwudo.epizy.com/heroes_of_shadow_4e.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_ce051e9a5fe44ab2876b4bff949e506c.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_f2aa883e97b4482aa1e3b9de8634077f.pdf?index=trueIn 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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 5452 bytes
SHA-256: 925fc4ad6c66f75288c998be85f14c40380209274168f5ae7f3368c92b1b84a1
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 11508 bytes
SHA-256: d76ca6db177ba5639a9d72ad5c833b7700fe0f5b95c5778ce81347d7718d01f7

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