Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddaa44d3fee58213…

MALICIOUS

PDF

74.3 KB Created: 2021-04-01 05:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f78130743ae4397ab8e80d2960ace90 SHA-1: 72448b98ef73d1ba2758fc784a590ade04617e3e SHA-256: ddaa44d3fee582135e56ef1a6b752b7336c24a69c6d06996bdd713d8c9879f03
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'xezojetit.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF's structure and embedded links are consistent with SEO poisoning techniques to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=essentials+of+business+communication+10e+pdf
    • https://gegotebure.weebly.com/uploads/1/3/1/6/131606057/minigizi_tazujamo_repinaxelimuwe.pdf
    • https://ruwivogisi.weebly.com/uploads/1/3/4/2/134265822/jiwivawabobunurobite.pdf
    • https://cdn-cms.f-static.net/uploads/4531523/normal_60225b4888e4e.pdf
    • https://cdn-cms.f-static.net/uploads/4495244/normal_604dc5e7cbc98.pdf
    • https://kasexesupa.weebly.com/uploads/1/3/1/4/131437862/c626c39473c2a.pdf
    • https://jenogisemelo.weebly.com/uploads/1/3/2/3/132303080/8022192.pdf
    • https://cdn-cms.f-static.net/uploads/4419001/normal_6021856494a13.pdf
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/jebiremu_tikimegovemujog_xileliz_suxedi.pdf
    • https://cdn.sqhk.co/merabuvi/iehjLDv/divoxixirivikujuvipu.pdf
    • https://cdn.sqhk.co/lagolipumepi/rid7DA9/6974398995.pdf
    • https://cdn.sqhk.co/jiwuwulu/8thjfji/27383895322.pdf
    • https://cdn.sqhk.co/tuwetebep/jjjie8K/speedometer_fortnite_season_4.pdf
    • https://cdn.sqhk.co/xafemepino/KfNjbih/world_war_2_facts.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_1d0dfb8ad4f445f2a097f80d51899621.pdf?index=true
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_185a1b2b835745a9ba8f05dfdc39110f.pdf?index=true
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_fa6b8123b5234747b7120e610ba8986b.pdf?index=true
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_2a9a7b9ca1e64e8b98a5e0a863b93100.pdf?index=true
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_5d4e2728d6f4452c981fc846abdcc622.pdf?index=true
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_4012b930c51e4ed487b2e280cb0facbd.pdf?index=true
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_839083da7a994cdfa11ffb4767f8b114.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_off0000e57a.bin
cc896d357a635e7081e3eaf2c402ea33ad0ad74f207cdfc0073ee463f856ebc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 5496 bytes
font_01_sfnt_off0000f81d.bin
7c7b0546f9484a89854e4f762a4e18cb54d6d45d01438916842f4f7435f0fbd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 10552 bytes

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