Malicious PDF — malware analysis report

Static analysis result for SHA-256 85339680087a30e8…

MALICIOUS

PDF

79.0 KB Created: 2021-04-15 23:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9aabc08f5b64a8088fb6e63b72a5681b SHA-1: 2857363e123fb9cc9484dd43b24a224c1d27cbe1 SHA-256: 85339680087a30e8fee4afde0b2592d8ec54c2cdcfe0e5f1be859597a00ecbb2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to suspicious domains, indicating a link farm or phishing attempt. ClamAV and ML heuristics confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=repair+craftsman+lawn+mower+self+propelled
    • http://sungo1.space/83146530172isv5s.pdf
    • http://xufededubumavif.scienceontheweb.net/vobalepe.pdf
    • http://icily.xyz/2006_bmw_330xi_battery_specificationsbfp85.pdf
    • http://xuzerujagojagip.scienceontheweb.net/4984258085.pdf
    • http://mists.space/converter_ico_pra_jpgtxpdx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/839ff6e3-5f8f-4ed0-aaff-d539defa6689/graco_simple_sway_baby_swing_weight_limit.pdf
    • https://uploads.strikinglycdn.com/files/62474f26-a8c7-48d3-bbab-eeb107af3776/jbl_eon_615_review.pdf
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_a804b855ad89498bae36167585a0802a.pdf?index=true
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_93471174144d4262b75945c2ce4d4fd0.pdf?index=true
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_0543f97beefa47a2bd5e2d50e14aab7a.pdf?index=true
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_b0e213feac3f4e938e870dc806d30cb6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/21688c34-0547-44d4-a66a-92846d827f06/dc_servo_motor_position_control_system.pdf
    • https://uploads.strikinglycdn.com/files/26c9442d-9cdd-44c0-a1d1-6c48db9766ad/54540630832.pdf
    • https://6680615c-3592-42a6-94f3-b98e474b5330.filesusr.com/ugd/252546_f673c9b4250a46d8a97a805d2d39ecc2.pdf?index=true
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_ced4d6ebca234ddebe6438e8da75e244.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e040e01-7512-48bb-8327-d7a7df0f9c0e/tanatapajuzikepozesefikid.pdf
    • http://wudazebej.atwebpages.com/taxodidovuwiwoludofes.pdf
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_ac82ea1d147c41269c7be9a9321e0c22.pdf?index=true
    • https://03234a85-d811-4a68-a1f9-f7315bf9ccb2.filesusr.com/ugd/079591_869415e9eb194c4d85c3c1c8ac1d48d9.pdf?index=true
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_2810892030f147099d736c514a802a7b.pdf?index=true
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_9da5f9477efa4fc6b6ab34e22e87e3f7.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5de.bin
beca2b2e60a795503617228f490ce4c701d1c931b8cfdc2e2870d7c2e4ebe12d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 5400 bytes
font_01_sfnt_off00010841.bin
4071ed9567b775f68ec24978c3ab580f019ac23dcc9f9c976e47a32a620019df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 11108 bytes

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