Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13aafc2d1881f85…

MALICIOUS

PDF

75.6 KB Created: 2021-06-04 19:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ebcd112a286aea0877aca7eb4c0c9644 SHA-1: e3f8b7e7f193249679ce7587403218f4a300ec0b SHA-256: c13aafc2d1881f854745adf8be87f02dfdc3f3c0037a79323a08e94030bdc63e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://jottigo.ru/123?utm_term=3d+euclidean+distance+transform, is a primary indicator 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://jottigo.ru/123?utm_term=3d+euclidean+distance+transform PDF link annotation
    • https://dakezevowefop.weebly.com/uploads/1/3/6/0/136088489/4920981.pdfIn PDF document text
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/947899.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/jirano-luluxamiramix-vemasek.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/2714821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453556/normal_5febf9fd452d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411501/normal_5ffc2cc32a0b4.pdfIn PDF document text
    • https://lanigitekepag.weebly.com/uploads/1/3/4/3/134395773/3944869.pdfIn PDF document text
    • https://livadekawa.weebly.com/uploads/1/3/5/3/135317457/43c523.pdfIn PDF document text
    • https://tukowozurowogof.weebly.com/uploads/1/3/4/4/134440104/6273268.pdfIn PDF document text
    • https://wupumemugate.weebly.com/uploads/1/3/1/4/131407036/refeg.pdfIn PDF document text
    • https://rikomurisixub.weebly.com/uploads/1/3/1/4/131454733/ziruvutukifef.pdfIn PDF document text
    • https://migijulomav.weebly.com/uploads/1/3/5/3/135394851/5033876.pdfIn PDF document text
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/8734030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_60541420458bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giribuv.pbworks.com/w/file/fetch/144597213/what_is_soil_profile_in_agriculture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bc02dd9-11ce-4e9f-85f6-dcdb7a41e261/58740237696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf21517-9284-4435-a940-487097d8df26/average_senior_manager_salary_in_malaysia.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144552168/womiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50f92e8-13dc-4892-91b1-88991b8f3b7e/bewabuxidusopojexeg.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/f/lejasedusivis.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_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 5236 bytes
SHA-256: 7ed270bbb597ffba68d002c5894aef9da6730c1f60eb3f9d5bd7e4632c6366cc
font_01_sfnt_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 10932 bytes
SHA-256: 5d0b41204afd693a35f9b419d099552459a5eff62f5f0ae1d55361af128550be

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