Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b2ecee8bf2e9cd…

MALICIOUS

PDF

93.3 KB Created: 2021-03-18 00:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 756947bf0fcfd79134b522ed120f66be SHA-1: 198145c70c7f9c8d79e421c925cfe4230504975e SHA-256: 72b2ecee8bf2e9cd5bb7193a27e9f363714c3a729ec00958f45638902c21ec1f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a link farm. This suggests a phishing or SEO poisoning tactic to drive traffic to potentially malicious or ad-filled sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://leonvi.ru/award?keyword=a+horse+walks+into+a+bar+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4451941/normal_60362f9349c2e.pdf
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5fcc74e6be686.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_ed5de13da9464db3a63b56894459c0ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/478dc8e3-a8a3-4c01-a695-89fb5d477c92/how_to_work_out_time_taken_in_physics.pdf
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_2d1a6f4a3a184d04a5d22a38917e7f5c.pdf?index=true
    • https://s3.amazonaws.com/fonibinaraj/android_actionbar_menu_icon_size.pdf
    • https://s3.amazonaws.com/tajimipojimo/unconfirmed_reports_suggested.pdf
    • https://s3.amazonaws.com/ginutu/premiere_pro_transitions_between_clips.pdf
    • https://uploads.strikinglycdn.com/files/6d7f1861-74a7-4204-834e-12a52cb5f2ec/how_to_take_apart_a_cpap_machine.pdf
    • https://uploads.strikinglycdn.com/files/6369af99-91c6-48b8-b9b5-70ec6ca4b78f/35232350824.pdf
    • https://uploads.strikinglycdn.com/files/8d6b7e63-5a47-4d3e-b1a3-66e580fe491d/rafemezojekimumavulenapev.pdf
    • https://s3.amazonaws.com/fasomusogapovi/g_n_m_form_date_2019.pdf
    • https://s3.amazonaws.com/jugobimuraje/sebowaximifegune.pdf
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_ca44c3c261484515a88f029d0c4b0811.pdf?index=true
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_99b8579c83e94025ae693f1da3ee896d.pdf?index=true
    • https://s3.amazonaws.com/zufaxepixiguxax/apollo_twin_mkii_duo_vs_twin_x_duo.pdf
    • https://s3.amazonaws.com/resixexi/96278390589.pdf
    • https://s3.amazonaws.com/vipuxafol/caldera_peisa_duo_f_manual_de_instrucciones.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_e51384a903864424b59c999c84379755.pdf?index=true
    • https://s3.amazonaws.com/geradi/19519660663.pdf
    • https://s3.amazonaws.com/sazomo/biwosexapepefurakizuw.pdf
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_481dfa715e704ffab4ab1126ef88c15b.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_off000119cf.bin
31abee84c8a40bcf62dbb6a0816367a7c565f06e7b3317b007562f36648932af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 5412 bytes
font_01_sfnt_off00012c3d.bin
c84798b2d9658c6073afd0cf879ac6a3057bf6b77d9cdc05e8c291f6b59e0f6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3D 11108 bytes
font_02_sfnt_off00015246.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15246 16060 bytes

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