Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb179fa649e3d75…

MALICIOUS

PDF

134.0 KB Created: 2021-03-22 17:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67a146db359b3622e7661dc855f48074 SHA-1: 70086266b0c3ed008d0d2eec65b0ab13f5c81d3d SHA-256: 0cb179fa649e3d756b8d266c9a04588b279b8873e2caf8153dcd653284c8acfb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farming or to redirect users to malicious sites. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent, specifically identified as a phishing or trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=english+collocations+in+use+advanced+2020+pdf
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/sepojogenatogedemol.pdf
    • https://nokojuponamipi.weebly.com/uploads/1/3/4/8/134891784/a7f48504b2d46f.pdf
    • https://cdn.sqhk.co/xonepogafix/jauDwgf/business_strategic_planning_ppt.pdf
    • https://cdn.sqhk.co/xetokive/gf5SjfW/3d_need_for_drift_java_game.pdf
    • https://jinezivatu.weebly.com/uploads/1/3/4/6/134687025/7983796.pdf
    • https://cdn.sqhk.co/jefapukawore/gnia7jd/tezoxizufixonudeg.pdf
    • https://cdn.sqhk.co/timadupak/gp4tL4P/10015351052.pdf
    • https://cdn.sqhk.co/temokika/bU3QEyK/vector_addition_and_subtraction_examples.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e37fb4d6-fac4-4cb1-96d9-cce2dae532e5.filesusr.com/ugd/ed2751_14e6c0bd3f9343fcb130839cab802961.pdf?index=true
    • https://s3.amazonaws.com/roware/90470413710.pdf
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_59e8717b98e04655a214665d44a641e7.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_68e899b753c64851ab0dc87bf8bddd5b.pdf?index=true
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_7e86536e40c24597bd038de4dabc6e1e.pdf?index=true
    • https://s3.amazonaws.com/purixifusipelid/ielts_writing_sample_answers.pdf
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_8703a349e1c34b0d95377e69ab2994cc.pdf?index=true
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_de65524ad3a34074882f8f3942502c83.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aedc.bin
b233f6f35d9202f8f94d16c3c1825c706774cb463c7c9fca59f5ad8b456e641b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEDC 5612 bytes
font_01_sfnt_off0001c212.bin
3275a366c97cf2b52feececad6dc814d8999aace9953fbe1d94ec480d083e728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C212 14968 bytes
font_02_sfnt_off0001f2f6.bin
757edbe9ca696dc752e8794cc2fab55b744a24b197aba41abea0c8f583a0f3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2F6 16116 bytes

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