Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f45b056de2990eb…

MALICIOUS

PDF

171.2 KB Created: 2021-04-07 06:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 491901f46bb3c05ebf49616b4e4f27f7 SHA-1: 51d4d453484127f685cc83cbb46f131236ba3d09 SHA-256: 6f45b056de2990ebc59143a4935f1873db5780c394b03bab6a5f8c4d4dde6322
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 high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, suggests a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=rock+band+4+ps4+eb+games
    • http://fofifokese.iblogger.org/liberation_theology_in_latin_america.pdf
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/fikof.pdf
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/6238517.pdf
    • https://badikodaxalele.weebly.com/uploads/1/3/4/6/134698448/jugipevuwerijiwaxuw.pdf
    • http://zumarezojupot.iblogger.org/11051476676.pdf
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/3399025.pdf
    • https://gowumobajakexe.weebly.com/uploads/1/3/4/5/134585768/zalasiligamuni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c4a0f302-b060-43a0-af10-a0364da5eca7.filesusr.com/ugd/c6d327_3b76b7cb305c4267a9a37f13c84c667b.pdf?index=true
    • http://zokapajenelu.epizy.com/water_aerobics_exercises.pdf
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_1c00795bcbad4f16af65e8c8a5b2cb63.pdf?index=true
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_cad5606b1a8d4e9887113c9472601b92.pdf?index=true
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_ca6c49b6a94244a9b4237bec67065b51.pdf?index=true
    • http://muravurut.epizy.com/organizational_behavior_book_by_stephen_p_robbins.pdf
    • http://dukizovisepo.rf.gd/wuxumimav.pdf
    • https://uploads.strikinglycdn.com/files/526a8c79-f22d-4501-b159-9dd42092b059/evenflo_platinum_symphony_dlx.pdf
    • http://fobapisarut.epizy.com/sql_format_timestamp_as_date.pdf
    • http://kateporabub.epizy.com/comparative_and_superlative_worksheets_for_5th_grade.pdf
    • https://uploads.strikinglycdn.com/files/994fdc9c-afc5-4123-980c-8dd873804603/mitel.pdf
    • https://uploads.strikinglycdn.com/files/9dd0bde3-7fa0-4fee-8b40-d80c87ca17b5/do_divorce_lawyers_give_free_consultations.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000263f3.bin
1ebf2a999c466c65b90e05002552f37936ccca795bee34ef2fb769173cb298f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x263F3 5564 bytes
font_01_sfnt_off000276e8.bin
a4db25641c0e467c7ac946cf438210330d8f6d55633521f2d3248b4e8884fd6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x276E8 11876 bytes

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