Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddcf31fd0c3009a…

MALICIOUS

PDF

77.2 KB Created: 2021-04-02 09:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bc756e917a73ca03d8ce9ff3df6e64a8 SHA-1: 954f55655b030cfe84ef8800d86b9b6176f59772 SHA-256: 8ddcf31fd0c3009a70334f1aa17a8ad74b671fb113b7dcb2fc7e2c347121c355
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/strik?utm_term=the+boy+who+harnessed+the+wind+wiki PDF link annotation
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/vajabakesigisejaba.pdfIn PDF document text
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/xuvoguneranuluj_nujus_fonedopomod.pdfIn PDF document text
    • http://mavixepajifulem.scienceontheweb.net/80500205497.pdfIn PDF document text
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/bosulik-mowudemuvod.pdfIn PDF document text
    • http://botefedej.sportsontheweb.net/jukakesotebat.pdfIn PDF document text
    • https://furimulu.weebly.com/uploads/1/3/1/4/131411024/wadubajif.pdfIn PDF document text
    • https://mijolepeworid.weebly.com/uploads/1/3/5/3/135394353/4967fbd.pdfIn PDF document text
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/5734141.pdfIn PDF document text
    • http://bestcreditcheck.info/best_formal_dress_stores4nf3v.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/zafilafirotavemabafe.pdfIn PDF document text
    • http://idslim-italia.site/fruits_quiz_questionsmquy7.pdfIn PDF document text
    • https://rumitubo.weebly.com/uploads/1/3/4/5/134525427/836405.pdfIn PDF document text
    • https://lakogobeza.weebly.com/uploads/1/3/4/0/134096968/dbcfab127e0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_c45dd1a76dfb4dccabab3d38df5e3ffe.pdf?index=trueIn PDF document text
    • http://gujimosodaza.myartsonline.com/alopecia_feminina_tratamento.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_de9806b78c3546b79693775a1f1f6b77.pdf?index=trueIn PDF document text
    • http://zevusup.atwebpages.com/types_of_organizational_structure_in_management_science.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_18e2d996e45c4574af07dad724895e37.pdf?index=trueIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_79ff5cae25e946198ffa736ae35a56e8.pdf?index=trueIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/am_communications_salary.pdfIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_5ebe9a6a565b4359b025805b06aca57b.pdf?index=trueIn PDF document text
    • https://9301df3d-c689-496c-811c-0581e5fecd74.filesusr.com/ugd/f62067_fdabc309853546d998cfac7afe47bb1c.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_6279ef6d34d24364935c5cb888f2a38b.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_fc0d07a6a2eb4a4785e81a681f2ed7d7.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 5228 bytes
SHA-256: e671dea09eb1cd2f25cc3a311ae82c812804df7722d5218a94b8b8df9a4ef8d8
font_01_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 11080 bytes
SHA-256: 274b6bf3effebd6a618ea51eeb9ae252e84669ff5a0807cfbcf6322ebf956083

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