Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b4cc027b40c010…

MALICIOUS

PDF

77.7 KB Created: 2021-02-25 21:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6d5e427b553d9ef98a649d1ae92c8938 SHA-1: 021667fa2cd04395a29c95d5dfa1165a0e277bcb SHA-256: e7b4cc027b40c0107ec33f8842e5e48455f5b213a1ba47345b614a9c4615e29c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URL and the link farm structure are the primary indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=fps+bypass+geometry+dash+mac PDF link annotation
    • https://vomuribo.weebly.com/uploads/1/3/1/6/131607062/3403268.pdfIn PDF document text
    • https://kumemuwopix.weebly.com/uploads/1/3/4/7/134709330/mufubozona.pdfIn PDF document text
    • http://magnetfix.store/53898039238fong0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5ffa7f2d59416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fd388018257e.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/7Ejiwib/cover_orange_journey_gangsters_walkthrough.pdfIn PDF document text
    • http://makamar.tech/jajadisivilevbv3.pdfIn PDF document text
    • https://riwivuzis.weebly.com/uploads/1/3/4/2/134265818/ed90d9eeaf.pdfIn PDF document text
    • https://xogevowizixid.weebly.com/uploads/1/3/0/9/130969953/nopixopumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_6030730420912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_600e32f2377c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_600e13967ce85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vimabamavarona.epizy.com/xerome.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 5284 bytes
SHA-256: a512915447a2e9f3722552cdc963a6e5f84e05d27574f79724b99315d56349fb
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 10944 bytes
SHA-256: 511bcf856c4bb030cee122ab36784c270eb8ce054fa11d1670b4ec54576a9a33
font_02_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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