Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4df5f661e81348…

MALICIOUS

PDF

95.6 KB Created: 2021-03-14 03:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d01f21f7f630c973a5ab50747d7e2297 SHA-1: d93443aa44e7f487e0b322252e9937f66cd381e1 SHA-256: 8e4df5f661e81348e8a79fcba3989b5a5a9fdfa602c7efece18a415f3f7d54c9
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a deceptive search result for '4.1 power notes biology answers', designed to redirect users to the malicious domain mezovuduw.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=4.1+power+notes+biology+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446944/normal_600020df73033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475580/normal_5ff90e20eb723.pdfIn PDF document text
    • https://nudezodubazez.weebly.com/uploads/1/3/1/1/131164524/530125.pdfIn PDF document text
    • http://silkhfig.bid/head_first_java_2nd_edition_download0tdoq.pdfIn PDF document text
    • https://lasaveba.weebly.com/uploads/1/3/4/4/134488520/d313bf83e8ff.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/oh_danny_boy_deutsche_bersetzung9vesj.pdfIn PDF document text
    • https://junezemojevav.weebly.com/uploads/1/3/2/7/132740237/17878c8.pdfIn PDF document text
    • https://jopokoguse.weebly.com/uploads/1/3/0/8/130874396/rupisifodon_tarazuwero_pisobujo.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/2000_ford_ranger_led_headlight_assemblyjsad6.pdfIn PDF document text
    • http://prodson.space/how_to_describe_sunshinebeb0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450042/normal_5ff8df9f13489.pdfIn PDF document text
    • https://jibedurudu.weebly.com/uploads/1/3/1/4/131455543/2251577.pdfIn PDF document text
    • http://richmaya.site/wudiluromamu3cy9j.pdfIn PDF document text
    • http://ufenmac.com/laxaxosevalazoxegakegukoie16.pdfIn PDF document text
    • http://openchambre.xyz/1.4_sistemas_avanzados_de_manufactura9c4np.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/goneduzum/xetopanakupugufalilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdf91f3-6cea-4467-92b7-fef2cf9b2828/75148475195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce6ed3a-7dff-4e1d-8938-576eca9c5577/pre_algebra_with_pizzazz_book_bb_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/manual_muscle_testing_extensor_pollicis_brevis.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/kapud.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/what_is_the_best_compound_mitre_saw_to_buy.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_off0001389c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 5396 bytes
SHA-256: 846b0d45c4abf6f8e1178a3d6e5cec3159e82b831869af738752ab35fa59c088
font_01_sfnt_off00014b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B28 11268 bytes
SHA-256: 2d98c0054a4c3718a6eaa65517f31cda06cf00508765accfb535012c845eba23

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