Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e73c09320066f0…

MALICIOUS

PDF

84.8 KB Created: 2021-03-17 07:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8c54bf7664e032c6a82ad3d3f9a80475 SHA-1: ddd698c95d04de5a7f234791a1d7d7d29fbce04a SHA-256: 94e73c09320066f034b6f4719232b0ac3650e0a9244eeca9dfb7ec018d93545f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document is classified as malicious by ML and ClamAV, and contains numerous embedded URLs. The document body, though heavily obfuscated, suggests a lure related to 'Windows server 2020 system administrator interview questions and answers pdf'. The primary malicious URL identified is https://seumenha.ru/award?keyword=windows+server+2020+system+administrator+interview+questions+and+answers+pdf, which is likely used for phishing or to download a secondary payload. No scripts were extracted, but the presence of multiple external links and the ML classification strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/award?keyword=windows+server+2020+system+administrator+interview+questions+and+answers+pdf PDF link annotation
    • http://profibrend.ru/navy_and_marine_corps_achievement_medal_citation_formatbf9mj.pdfIn PDF document text
    • http://cucoupon.info/nsfas_online_application_form_20186uawx.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/can_you_make_any_dishwasher_panel_ready.pdfIn PDF document text
    • http://viziziziv.mywebcommunity.org/askep_angina_pektoris_tidak_stabil.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/560113725.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/hjjptPi/96878789995.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/Bhc0jc7/bebitexok.pdfIn PDF document text
    • http://laithub.pro/price_of_sika_top_seal_107455n4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459628/normal_604843e38ead0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371791/normal_5fdeb0c38871e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lobakixadob.epizy.com/komujubufipot.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_6eadeefb62ae4a64969df19b02542ca7.pdf?index=trueIn PDF document text
    • http://zapizuw.rf.gd/nazinunabemetemoziburar.pdfIn PDF document text
    • https://5e1ecd50-e572-447e-9dd1-c60ce64867c5.filesusr.com/ugd/9b2d9b_facd68f4f6f14718986f13e8233a5c14.pdf?index=trueIn PDF document text
    • http://korofituzuxigu.onlinewebshop.net/subway_roasted_chicken_salad_nutrition_facts.pdfIn PDF document text
    • http://jemileti.atwebpages.com/gameshark_cheat_codes_pokemon_emerald.pdfIn PDF document text
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_f2b0cc1808eb4398962e3c2708a9f921.pdf?index=trueIn PDF document text
    • http://lobaman.epizy.com/total_recall_2012_parents_guide.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_81ca6a2b4c294295b70d4410ef01f64d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 5704 bytes
SHA-256: 0b97717556516db44ac6ae8f999f499bb17a8b482a0d6e35de41aa53bf658314
font_01_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 10668 bytes
SHA-256: e7c5f8c6d7ff12560319cb6d209a7165762ba9407d229cea218ffd767210cded
font_02_sfnt_off00013769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13769 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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