Malicious PDF — malware analysis report

Static analysis result for SHA-256 74beddb24fbcdaab…

MALICIOUS

PDF

83.1 KB Created: 2021-01-10 20:16:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9f6062433552a0fb9de6ba56aae81e44 SHA-1: 533c9c36f534461cb52fdb076f858d9a74ef46bb SHA-256: 74beddb24fbcdaab38d1c92929bdef3907c5282c337a50bbbe05ee095979493d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, identified as a link farm, with one URL specifically mentioning 'tibia druid leveling guide'. This suggests a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://traffking.ru/123?utm_term=tibia+druid+leveling+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f8837ab9605a.pdfIn PDF document text
    • https://site-1177584.mozfiles.com/files/1177584/addition_sheets_grade_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_5ffae782a75d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_5f927c2bacc49.pdfIn PDF document text
    • https://site-1173456.mozfiles.com/files/1173456/three_defenders_2_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_5fac522c35ac7.pdfIn PDF document text
    • https://site-1175238.mozfiles.com/files/1175238/segivikawagu.pdfIn PDF document text
    • https://site-1168289.mozfiles.com/files/1168289/4917881495.pdfIn PDF document text
    • https://site-1172508.mozfiles.com/files/1172508/19478053142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5f8dc394aa195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5f9de4c1c9f67.pdfIn PDF document text
    • https://tasitovutad.weebly.com/uploads/1/3/0/9/130969559/wozapiwekenog.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/6180587.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/jovekus/acronis_backup_12._5_linux.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_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 4964 bytes
SHA-256: fe4e4e8f7b4a4e67eca1cad2b237defa2d8f0b947c6b5977f8f7b474f9347e3d
font_01_sfnt_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 15040 bytes
SHA-256: de75c3eaefa79c7788220680e119e9607feb130f19d4c3c7f0a53f60804f9969

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