Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a4b37c5f032fbb…

MALICIOUS

PDF

72.0 KB Created: 2021-05-03 01:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cc0ea949fce374fe8bbf4ff67439ac30 SHA-1: 94e9fece42d95f7ec266e1f26ed74d8fb0ffd8f1 SHA-256: 12a4b37c5f032fbb26a18568e6433100a9d698477331e9893a7e8f1a42f2d3c9
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme. The document's content, though heavily obfuscated, appears to be a lure related to 'gender roles in chronicle of a death foretold prezi'. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely phishing or malware distribution via the numerous external URLs. No scripts were extracted, but the PDF structure itself is indicative of 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=gender+roles+in+chronicle+of+a+death+foretold+prezi PDF link annotation
    • https://cdn.sqhk.co/sosexazefip/qaxgdgj/parler_app_not_working.pdfIn PDF document text
    • https://lobubizewi.weebly.com/uploads/1/3/1/8/131856209/nabudipibad.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/jaxot.pdfIn PDF document text
    • https://lopuvekire.weebly.com/uploads/1/3/0/8/130813144/xepefofusufozi.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/9166273.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/ihXG6ib/rotokitapejajakugo.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/b02c5e.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/nuxejotibuno.pdfIn PDF document text
    • http://jurelireroxux.22web.org/benelli_bike_sound.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/BicBZgc/the_latest_vikings_game_guardian.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/jdWKogg/verizon_message_app_keeps_closing.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/nUjbjgu/50405064259.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/rufonali/design_vector_free_ai.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/wedosados.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/seagate_model_srd00f2_5tb.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/poporilikixivavumudi.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/what_is_greek_orthodox_religion_beliefs.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/19947929557.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/how_to_calculate_flow_rate_in_a_pipe_from_pressure.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_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 5324 bytes
SHA-256: 345f035484ca99565609c459626f867b1328dea18fca237c7541cf338713aa88
font_01_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 10704 bytes
SHA-256: 14cf790cb29ad8792358b8a45babcf42dcb54feea75afdf4ba61b2a7bd226fb2

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