Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e71e35a0aabb313…

MALICIOUS

PDF

75.6 KB Created: 2021-05-10 19:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2525db9fef79c4a9c81e3877e5dc8757 SHA-1: 3075738d3a7b875cfddd2c3aa28ebf3295b2e243 SHA-256: 7e71e35a0aabb3137c9683d170247d83ec7760549cece355deffd37f5fdb135c
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one suspicious URL pointing to a domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=how+to+calculate+w%252Fm2
    • http://manamuposa.getenjoyment.net/wevuwivusuzuro.pdf
    • http://devedilazabu.medianewsonline.com/dsdm_agile_framework.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_3b03c4a4baf04ced88c15eaec9c7926b.pdf?index=true
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_812f6ef34daa4cac88455b229421a76c.pdf?index=true
    • https://s3.amazonaws.com/bejexe/amnesia_horror_game.pdf
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_5e6ad98d6a4e49e8a88ea4ab096ec546.pdf?index=true
    • https://s3.amazonaws.com/potofaw/aium_guidelines_breast_ultrasound.pdf
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_e3fb5889ddf745b4b20efd14af665733.pdf?index=true
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_0caaea67d8b14e42a9cbbdfa2837d5cc.pdf?index=true
    • https://s3.amazonaws.com/gajakelegeza/the_fairytale_of_new_york_sheet_music.pdf
    • http://gegetebipa.atwebpages.com/experimental_methods_in_wastewater_treatment.pdf
    • https://uploads.strikinglycdn.com/files/87b34a93-738b-4ac8-a641-4e90590aac97/38457305694.pdf
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_60eba3e39b8f4df98d51f18754b3ed1e.pdf?index=true
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_accfb36241534936b31d4f449ec8dcde.pdf?index=true
    • http://pelebirepopo.onlinewebshop.net/16855376757.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_7e3fcc42897a4fe8882b44ab3defa4e6.pdf?index=true
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_14bc43862e8643c684c19107c312ed96.pdf?index=true
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_f6fedb3628a84f53b29cab2b9107ae4e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/25557962-ec23-4042-8074-e716310d88f6/9097878388.pdf
    • https://s3.amazonaws.com/kavugusepe/26792596680.pdf
    • https://s3.amazonaws.com/piwupevivotixi/42684629496.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_off0000ece1.bin
f17dc0914925eba1815b53319210fdf0a0dbb98cbbd7c3f65a90545dcb33305c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 4892 bytes
font_01_sfnt_off0000fd90.bin
ca28a3f3366635d514e822df7e984c6f20f6d5ef809bfd207366d2ec0a82d53c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 10740 bytes

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