Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6ea999bd6eb81d…

MALICIOUS

PDF

82.7 KB Created: 2021-04-04 16:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0885a500074a96b8ed0a8a81cf699c47 SHA-1: e94e8a9f4bfe2e1ceea0261ed9c60d526e275674 SHA-256: cf6ea999bd6eb81d039d335a7b90594a2f4648efeb568b7b4db5a6b4562b6dfc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and a machine learning classifier, as malicious. The presence of a "PDF_SEO_LINK_FARM" heuristic and numerous external URLs suggests an attempt to direct users to malicious sites. The "SE_ADVANCE_FEE_SCAM_LURE" heuristic indicates the document's content is designed to deceive users, likely for financial fraud. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://soxebez.ru/award?keyword=bsc+agriculture+study+material+pdf
    • https://cdn.sqhk.co/filovixedalu/dnN1Vry/32007165462.pdf
    • https://cdn.sqhk.co/dugelabomaw/hbiiRhg/arctic_animals_kindergarten_lesson_plans.pdf
    • https://somakala.weebly.com/uploads/1/3/1/4/131409557/711b295.pdf
    • https://cdn-cms.f-static.net/uploads/4481062/normal_601132da285bf.pdf
    • https://static.s123-cdn-static.com/uploads/4427529/normal_5fdf4dea38c1e.pdf
    • https://cdn-cms.f-static.net/uploads/4445745/normal_6033c2c77d985.pdf
    • https://cdn.sqhk.co/sozimelizak/gBQNS3u/ordinal_definition_of_stress.pdf
    • https://lafuxekezijunu.weebly.com/uploads/1/3/1/4/131406487/5335592.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_be30b8975c634b25b78074306613a363.pdf?index=true
    • https://s3.amazonaws.com/mufukep/jutiwiluvam.pdf
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_873a058f2ced44d6ba56f653d4c6b24d.pdf?index=true
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_60a3d806c14141c586fd32b10dd83c24.pdf?index=true
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_bbc0d9e62eb244d58b30e83ea7322d46.pdf?index=true
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_60a90a8fb27f4f98a37ee648b0bf4a50.pdf?index=true
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_fdd1aef1bebf4820bb56b9c84072ba3e.pdf?index=true
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_6f74a186371a4e07a1a4b650b1434cc7.pdf?index=true
    • https://s3.amazonaws.com/pajukovuxetu/adobe_acrobat_pro_dc_for_android.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_off00010138.bin
9308c82c45705363c494da06944e922b3be1b91f220a74d24baeafea8908a403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 5624 bytes
font_01_sfnt_off00011453.bin
6488258fc5105da771df45e6c73eba79dd01424eebf3560bead67038e24db3eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 11584 bytes

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