Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0031393ac9d8612…

MALICIOUS

PDF

79.0 KB Created: 2021-03-17 09:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90817e2d68a2523c813c04088c37cc8c SHA-1: d6116c49b7f96465669ba39777fa0d6a275a859b SHA-256: b0031393ac9d8612e5877bc908448f52f00d22db24e70b9e531508723ab882c8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, with the primary suspicious URL being https://xezojet.ru/wix?keyword=ono+kine+recipes+mochiko+chicken. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/wix?keyword=ono+kine+recipes+mochiko+chicken
    • https://static.s123-cdn-static.com/uploads/4501656/normal_5fc7f8904a7e8.pdf
    • https://cdn-cms.f-static.net/uploads/4391340/normal_6048d690bdd3d.pdf
    • https://sogorowov.weebly.com/uploads/1/3/4/4/134475374/xijenoluremo.pdf
    • https://fezipogapatud.weebly.com/uploads/1/3/4/8/134888370/8583549.pdf
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/402571.pdf
    • https://static.s123-cdn-static.com/uploads/4465151/normal_5fc9bfb47975a.pdf
    • https://biwewonopegad.weebly.com/uploads/1/3/1/3/131380063/mipuben.pdf
    • https://cdn-cms.f-static.net/uploads/4371814/normal_6025067a39151.pdf
    • https://puxofigu.weebly.com/uploads/1/3/5/3/135347112/dezoxebusuwoxunedep.pdf
    • https://lowunipuso.weebly.com/uploads/1/3/1/4/131453219/387d10a1.pdf
    • https://static.s123-cdn-static.com/uploads/4501645/normal_5ff90a4a5fcaf.pdf
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/tilovutozapunexexa.pdf
    • https://cdn-cms.f-static.net/uploads/4489415/normal_601fee77c9824.pdf
    • https://cdn-cms.f-static.net/uploads/4489587/normal_60121e81eed75.pdf
    • https://static.s123-cdn-static.com/uploads/4450883/normal_5ff447667f163.pdf
    • https://debarinibew.weebly.com/uploads/1/3/0/7/130775297/43b2837d2ad08d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_ac7346122d2247558250741a675b07f8.pdf?index=true
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_9448506ea1db4756ab776b02f0723e28.pdf?index=true
    • https://11d080c5-195a-43cd-8542-9af39b337c0f.filesusr.com/ugd/9b7d8a_78c40b49b3bc46a5bf532be4d6a24406.pdf?index=true
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_9d60e2af79a94b39b2c9f1fe3ab55fc2.pdf?index=true
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_9da621c3380d40048b6205f46753657e.pdf?index=true
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_17b3eab3e7574e0baf85b69f7388d76c.pdf?index=true
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_8bfca9454bf74291ad699b3e911399cd.pdf?index=true
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_b1ff91bc777d4e2881b41fb66f3e3990.pdf?index=true
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_e71e904a22934e208e88c45c4ab85ab8.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_off0000f869.bin
72f675dbedd7402cc680482d6b837d1965498b612c390a7e6a80894754d962e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 5020 bytes
font_01_sfnt_off00010958.bin
68ff72bb597be9c9dca084c9c3d828ce51c4bf0fc12a69e486880a9a284f1758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 10920 bytes

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