Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bd7ea051a02245…

MALICIOUS

PDF

85.4 KB Created: 2021-03-24 12:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f03154c3d0ccf3a718d4a9d804e38c4 SHA-1: d2c44ceaa6097ded514d80c1d28c1280d63ba964 SHA-256: c3bd7ea051a022450bb1f85ac94ca8937a85776adb6787eed6b466ee01a7297f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a site that appears to be part of an SEO link farm. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The embedded content, though heavily obfuscated, suggests an attempt to disguise the document's true purpose, likely to drive traffic to malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=ralston+valley+baseball+coach
    • https://cdn-cms.f-static.net/uploads/4501212/normal_6054705c6713a.pdf
    • https://cdn-cms.f-static.net/uploads/4391317/normal_5fd98a3b912ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3f4c131d-f945-452f-88a4-6c0d2eb9f645/8th_grade_math_probability_worksheets.pdf
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_3ec06e2c697542878ec69cf148f10fe9.pdf?index=true
    • https://s3.amazonaws.com/luxelula/how_do_you_build_strength_for_football.pdf
    • https://s3.amazonaws.com/numegubowalonan/chemistry_of_materials.pdf
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_5892293a242c4aad9e8cead01a49c951.pdf?index=true
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_0a85e08cbac4416196d37bc94001d075.pdf?index=true
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_00484d1d610d4fcba27a605630a27e9c.pdf?index=true
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_8eed3caad1c54112b9b2250a988f796e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ce7fb8ab-c2c9-43e7-b788-957161271adb/mizizafisabututa.pdf
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_d99e4c6bb8ef47d59f53ad9b6b0f2dae.pdf?index=true
    • https://c4a0f302-b060-43a0-af10-a0364da5eca7.filesusr.com/ugd/c6d327_af8455eca01c476cb13759c510b332b3.pdf?index=true
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_42ac923e3ef643a78168ffd35c9c54e8.pdf?index=true
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_6a5f1abb32ff4358b9b7e19a0bf2482f.pdf?index=true
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_f748e7a884ee4dcb8d0a5532b16b8c31.pdf?index=true
    • https://s3.amazonaws.com/xozeb/jisazabitufanutu.pdf
    • https://uploads.strikinglycdn.com/files/592e9005-8fdb-49fb-bac0-af0a6eeb7f21/lusijinigojosakazoxub.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_off00010d88.bin
3e2ea83eb22e7d7f20e4d6fa4cd9470c38123af43acae82b23fcc285e8dfcebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 5100 bytes
font_01_sfnt_off00011ef5.bin
47ec51f04d94d3cb8aa0cf7c66ffe96ab8d8b5d4fdc2e07502ba73e5c80d7eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 12252 bytes

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