Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c02144e44d8d65d…

MALICIOUS

PDF

80.7 KB Created: 2021-05-16 15:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0825de565808440b71c6e9322e50f726 SHA-1: de22667accb8f2e2b8dba036da984aaa82e8c7b6 SHA-256: 6c02144e44d8d65d807527b5315148d4bb5c03a15ca8818493f72e251b2e3f49
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an external URI pointing to 'vilenefex.ru', likely a malicious landing page. The document body, though heavily obfuscated, contains references to 'Sunbeam bread machine' and 'wkhtmltopdf', suggesting a lure to a phishing or malware distribution site.

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://vilenefex.ru/strik?utm_term=sunbeam+bread+machine+5833 PDF link annotation
    • https://cdn.sqhk.co/dajebala/jgjgTgj/psplay_unlimited_ps4_remote_play_download_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_5fe8f2a2a23d1.pdfIn PDF document text
    • http://lurubalopare.sportsontheweb.net/84741593680.pdfIn PDF document text
    • http://gogodolajukapob.22web.org/full_metal_jacket_speech_text.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/eujiRVW/ccg_tower_defense_offline_td_strategy_games_2018.pdfIn PDF document text
    • http://fefikaniki.22web.org/83296275763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_601ed997e1489.pdfIn PDF document text
    • http://boterilutonesi.iblogger.org/neoplasia_prostata.pdfIn PDF document text
    • https://cdn.sqhk.co/rorexamuviz/9gcibK6/74915400704.pdfIn PDF document text
    • http://monubagujizud.mywebcommunity.org/letter_writing_format_in_english_formal_and_informal_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joberemig.atwebpages.com/tawatajedutiroso.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/mepizogixedodijedidodada.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/2368421025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837bbbc3-1678-407e-bd02-d365afbf68d1/singer_sewing_machine_info_uk_phone_number.pdfIn PDF document text
    • http://fabavokawibawo.epizy.com/hdfc_life_term_plan.pdfIn PDF document text
    • http://laxaguwen.epizy.com/airbrush_pro_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0883dcf4-692d-4b04-a0a0-8e97f8a9162b/how_to_write_up_a_room_rental_agreement.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/62629860977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2c7520-52c8-433c-a8ed-d57b89b5e748/87737548507.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_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 5696 bytes
SHA-256: 47956d49b1ca9d4412310272318f56b031209171595fee5c96bec86eccefe946
font_01_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 11584 bytes
SHA-256: 525a07fdfb6ccc4129f4a6d3cbd11a3fbb2916a03be0fab440d980b7d51b2f98

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