Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd44fad9764df4a…

MALICIOUS

PDF

77.2 KB Created: 2021-04-03 18:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e764f308cb6b8d34c024fbe542b2957a SHA-1: 830bc988ae911836e74e8fc3f20bb314426b377e SHA-256: 4bd44fad9764df4aed776ed1e3b4b9b9436f6219eab7208f4548cb5c68cde282
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating it is designed to host numerous external links. One of the primary external links points to 'zajinet.ru', which is associated with SEO and potentially malicious activity. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://zajinet.ru/wix?keyword=minesweeper+best+unblocked+games
    • https://devubavoxonor.weebly.com/uploads/1/3/2/7/132741482/kitumuzifamevo.pdf
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/948507.pdf
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/febozewuxoxala_fifakibeb_witomijapez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dagasopones/kegipufosolilajubo.pdf
    • https://s3.amazonaws.com/mikibetiv/english_textbook_class_11_cbse.pdf
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_c257ad7804b54a9497431dfb831672e5.pdf?index=true
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_c71409b8fc9b4c1c909afad5b24fd374.pdf?index=true
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_c376f5ed492a48bdb07223ff56ad798b.pdf?index=true
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_f9c92be3eecf45279107a1d3ba50a1f6.pdf?index=true
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_0b269a6a83504c50bb581f80ba369ac0.pdf?index=true
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_a5cb8e537a594c349f23c67af9c30fe4.pdf?index=true
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_9e96394c0f6148d3a5e3d3b8c4317b51.pdf?index=true
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_626b39556ceb44c2bf3860ac214e3b84.pdf?index=true
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_e07eaf721f514fb5b97dae20f92dc831.pdf?index=true
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_1df13b50b8ce4d3a97b0237dadd83705.pdf?index=true
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_0a248556b4e54ed4831956d6b96a564b.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_off0000eeb7.bin
7a8bf34d398810b3fe8840c20e43fa9c246b43cec3611f65e7d1cbb18f8c2c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 5696 bytes
font_01_sfnt_off0001021b.bin
2d9268bd1ab5ebdecad63612daaa28c9bee173266c473a4c418a6c1c51805860		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 11376 bytes

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