Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a2b29ca95adf8c…

MALICIOUS

PDF

73.9 KB Created: 2020-11-09 22:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 726ff77f9836e5d7581c63f059ace028 SHA-1: d2b9a60ae14737129138cf4f42db06687539b6fd SHA-256: 78a2b29ca95adf8c3850fb497d138830fbff8b27dfc97ff7eab4e2233962bd47
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/strik?keyword=remote+control+airplanes+for+kids PDF link annotation
    • https://mifuvepezomiluf.weebly.com/uploads/1/3/4/3/134312517/kexefuvon-sijulisi-ximumun.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/c7dfbd327.pdfIn PDF document text
    • https://tumogifizutuvo.weebly.com/uploads/1/3/4/5/134527103/9748981.pdfIn PDF document text
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/rifovesuxodagodi.pdfIn PDF document text
    • https://jajoteraluwem.weebly.com/uploads/1/3/4/1/134108878/gusin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f8915ccb37f0.pdfIn PDF document text
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/262af565bb2a7c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuniku/jurassic_park_theme_piano_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/xawibasorovuliwud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ecc965-dfb0-4514-aeec-281205f65bf8/tagazisizebovonulu.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/72109886152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1b6b99-2274-4e1f-ac41-3ee6dad4dc33/41627554374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817ea5da-0605-4471-b976-f3a7eb0bff18/87834478257.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 5372 bytes
SHA-256: ba380ecff799b091dd0ed934eb4b72f85c871ed5165fcb6cf8a66a7489cb179c
font_01_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 10756 bytes
SHA-256: 7025b4b2ecc85984d663f5b81338cf1ca29307747ca930d36ac5ffea4ed07b2c

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