Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8ccb1589c584ab…

MALICIOUS

PDF

79.4 KB Created: 2021-03-20 04:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21ac0c837463a3aa02ccd9935de8949e SHA-1: d253b80f81ec9ac6192d80b2a5add301e61bec09 SHA-256: 6a8ccb1589c584aba9122a5cee7c15652ef42e5e3a005c8771165e1b172823bd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://bologen.ru/wix?keyword=discipline+equals+freedom+field+manual+mk1-mod+1, which is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/wix?keyword=discipline+equals+freedom+field+manual+mk1-mod+1
    • https://cdn-cms.f-static.net/uploads/4425238/normal_603943d21ca18.pdf
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/5208215.pdf
    • https://tazirive.weebly.com/uploads/1/3/0/9/130969887/1702103.pdf
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/786118.pdf
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/sutomazefinedademog.pdf
    • https://cdn-cms.f-static.net/uploads/4478688/normal_6050d686c9e74.pdf
    • https://cdn-cms.f-static.net/uploads/4463812/normal_60115114c1aa1.pdf
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/43b42b48276198.pdf
    • https://vikuwavek.weebly.com/uploads/1/3/4/5/134506456/a88842f0a99.pdf
    • https://cdn-cms.f-static.net/uploads/4485576/normal_5fe79ee130434.pdf
    • https://cdn-cms.f-static.net/uploads/4372377/normal_6033647002e9a.pdf
    • https://jikegasabum.weebly.com/uploads/1/3/1/8/131856907/ab17f162d1.pdf
    • https://kafememum.weebly.com/uploads/1/3/4/6/134616831/gewedazive.pdf
    • https://tiputanamadavok.weebly.com/uploads/1/3/5/3/135314880/1540976.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_4af1a8d91c2240f89929461b3291324d.pdf?index=true
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_3e6530adac9c4461b981cbb778bb4a1b.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_6dd5caf519274127ae4aea4d02d70f3c.pdf?index=true
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_4a6460bc880744ebb9543e97e9addf9e.pdf?index=true
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_5b0b6f3287eb4e24955fe285a69f6e6e.pdf?index=true
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_027f2774f5a041668856b9a36fe1e1fe.pdf?index=true
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_3fe0827f1add43eeb540236bb98f11fd.pdf?index=true
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_4201ac8032f84fd1af4facf4d4b2a73f.pdf?index=true
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_c4ac53e843a74319a8de6c9fcb991288.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6d.bin
f5a3ece7386ca69f28abc7bc5f7623154ed3731d9540c63816ef3ab76c113e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 5376 bytes
font_01_sfnt_off0000fc9e.bin
b3cb95a2bd6d593670d2e34eca815848196dd2522d059fb0ccd37d75e17dfe42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 10912 bytes
font_02_sfnt_off000121e3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 4324 bytes

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