Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91dede479e3ae90…

MALICIOUS

PDF

72.1 KB Created: 2021-03-30 10:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e1f5f32cc4fd9ab6b6d5ca33deb7e207 SHA-1: 1bc9afec7161ae9eb8b90e2074af4186f32fbeda SHA-256: c91dede479e3ae90659ca5bbdefe0cfd5f0bb1f85c51a42377d2a915e7cbb346
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a strong intent to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of these links, suggesting a tactic to obscure the final malicious destination.

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/strik?utm_term=11+22+63+season+2 PDF link annotation
    • http://wiwajekirutiw.scienceontheweb.net/92720184418.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/2af6950e3.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/walmart_black_friday_sale_11_14_20.pdfIn PDF document text
    • http://terem.space/blood_pressure_monitor_amazon._de58bec.pdfIn PDF document text
    • http://sberbank.link/arturia_minibrute_2_semi-modular_analog_synthesizerhmno1.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/7488df6.pdfIn PDF document text
    • https://titanukudolilip.weebly.com/uploads/1/3/6/0/136082060/8905136.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/8haZNf2/pinball_heroestm_complete.pdfIn PDF document text
    • http://megahit.space/tumukubevab8mcps.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/iijccvZ/minecraft_pocket_edition_pc.pdfIn PDF document text
    • https://wurivebufe.weebly.com/uploads/1/3/0/8/130874680/rixapeniwa.pdfIn PDF document text
    • http://fastpeysistem.online/72160901031b70o2.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/danebijadinulupuleworov7kt6.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/RnGjanW/fox_sports_live_scores_boxing.pdfIn PDF document text
    • http://garugitadow.22web.org/75384673486.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/vovopafubipu/written_warning_letter_template_for_insubordination.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/sotasarurusimi.pdfIn PDF document text
    • http://puzegekizizovin.epizy.com/dovilosowidalodabaletimeg.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/accrual_basis_vs_cash_basis.pdfIn PDF document text
    • http://povemuxituziv.epizy.com/17375658086.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_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 4956 bytes
SHA-256: 2cee40a1e11651e37fa45b056bd706e4b303b652f4b62b93845e5b78d0daa4b4
font_01_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 10836 bytes
SHA-256: 111651052398810a88f15d7d84f7671784479c9cafc257ec3fd938b4fe9b9e04

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