Malicious PDF — malware analysis report

Static analysis result for SHA-256 9570b57c2d034275…

MALICIOUS

PDF

68.4 KB Created: 2020-11-24 17:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 445a7c21d116807a2aaa260cd463ca3d SHA-1: 9b825414e11f2bd0e07c051439799d68d032e0ac SHA-256: 9570b57c2d0342750ecbeba66560928a7ab008ef2cd5542b3c883d12b3f3c1cb
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://traffine.ru/strik?utm_term=redeem+xbox+360+code+on+xbox+one PDF link annotation
    • https://wuzovogupo.weebly.com/uploads/1/3/4/7/134720757/343cd.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/3669821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463565/normal_5faba3d180b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5f8ed862b717c.pdfIn PDF document text
    • https://bogemokized.weebly.com/uploads/1/3/4/3/134386998/743165.pdfIn PDF document text
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/4cf44b3017.pdfIn PDF document text
    • https://zexivuwesime.weebly.com/uploads/1/3/4/3/134356920/wuvikoxiwov-xigesena-jiragunubewaz.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/remeranexe/puginizefusikikojagifix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74575c38-c77a-4d1d-ad59-27be69406dd9/rifisomo.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/13466966510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8460eb3a-7cf6-4225-8d0c-a9f493229881/rozizovut.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_off0000ceaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAF 5244 bytes
SHA-256: 2ae722105deea08c46651210fef0f9eaea068100ba1e3e6ded9c76606867d578
font_01_sfnt_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 10732 bytes
SHA-256: d2cb6be4d27c977f0ac1495556243aa8c70dc39585c53392a13870183237ef3f

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