Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d53c1a40e28280…

MALICIOUS

PDF

89.9 KB Created: 2021-03-03 11:31:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 81e25ae7b6825490e43bd6d861b87a7e SHA-1: 7faf46e15df21d392923638321fded5f66a356be SHA-256: a1d53c1a40e2828012fdf6a3dc489aa4850164629abfdce1d2d5881bb9cc9324
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically mimicking a search result for 'what is the best 4000 watt generator'. This link redirects to a malicious domain, mezovuduw.ru, indicating a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to use disposable hosting for link farms. Although no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest malicious activity.

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://mezovuduw.ru/strik?utm_term=what+is+the+best+4000+watt+generator PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411511/normal_5fc9e85ed0a70.pdfIn PDF document text
    • http://ukranews.icu/sat_math_sample_testsx4tut.pdfIn PDF document text
    • http://swiss-gear-top.xyz/dotujuribudorfe7az.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_6023eaa1ac24d.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/0HicP2i/terminal_block_3d_model.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480732/normal_6037bafae9968.pdfIn PDF document text
    • http://jezugelevafebir.22web.org/safebowa.pdfIn PDF document text
    • https://cdn.sqhk.co/tutogalubete/Ygiih6H/sniper_shooting_battle_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/jdcIzks/alchemy_definition_simple.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/hhi6jc5/xapumukobiw.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/ieihhhr/puzekefifuwikizekimowime.pdfIn PDF document text
    • http://yarrebitteh.online/cnn_student_news_weekly_quiz_answersozvsb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_6019ca264ce54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_60305fc39a50a.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/widetunipet/cambria_font_free_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/use_of_numbers_in_formal_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/algernon_blackwood_the_empty_house.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/22565975876.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_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 5388 bytes
SHA-256: 463516ba901bf789635c52f22abf6645d6a8ff4d73db611757cea77f48585295
font_01_sfnt_off00013411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13411 11220 bytes
SHA-256: 3b2763bbc7f9d8442006ce4c2a1c8c5fb5bea44507199cd9783542666032e104

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