Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97f3260f17e9032…

MALICIOUS

PDF

82.6 KB Created: 2021-02-25 09:29:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d0816e1e84c252825fe7cd998492e7e7 SHA-1: a918b92b1bcbe69891b018682f52297aca166712 SHA-256: e97f3260f17e9032194493b8693da38c44a62b45ebac837076ffbf445d9a672b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, with at least one identified as a link farm hosted on disposable infrastructure, suggesting an attempt to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains metadata related to PDF generation, but no direct textual lure is discernible. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

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=what+are+some+fun+diy+projects PDF link annotation
    • http://blablablacar.online/visual_workflow_developer_guidewicvw.pdfIn PDF document text
    • http://1xbets-regs.site/97292575246rxmzn.pdfIn PDF document text
    • http://pravagims.net/xanejogokesifet1v9wf.pdfIn PDF document text
    • http://trastenmyqort.online/22564669057dotdz.pdfIn PDF document text
    • http://tixshopclub.fun/marvel_s_avengers_infinity_war_preludezpwex.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/jdTsm1p/zekenabarifoboz.pdfIn PDF document text
    • http://zewenidasi.iblogger.org/ancient_history_books_free.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/TBeqSgf/online_gas_booking_app_for_android.pdfIn PDF document text
    • http://septiki-rf.website/14076226372tnsdd.pdfIn PDF document text
    • http://limons.space/kms_office_activator_freehn4wu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zivuneko.epizy.com/perfect_english_grammar_reported_speech_exercises_1.pdfIn PDF document text
    • http://burupilejeg.epizy.com/bejuwoxusegubizizegu.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/lion_dota_2_guide.pdfIn PDF document text
    • http://damewanobojojo.rf.gd/59817100902.pdfIn PDF document text
    • http://xifebudi.epizy.com/vutabogofu.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/xuvavalopufofesimifanamil.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_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 5552 bytes
SHA-256: dfb529590e7b9cd7a03009e3efa16ae936eca86f59023331a0a26d230a66271a
font_01_sfnt_off00011822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11822 11432 bytes
SHA-256: f303a632faa82ee4c9681a57356a79dbe8d5f5478ec59fb0fe3da582f00cc992

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