Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dfdbfd70108e9e…

MALICIOUS

PDF

90.9 KB Created: 2021-02-22 19:26:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05cce7bfc2c6548974c51d5cb4de4e32 SHA-1: ba19236da205fed4c804fd299c725f47f1061d35 SHA-256: 12dfdbfd70108e9e0f9b8ede60124328420dd6dc6bd489b48f381852a4143fce
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, indicative of a link farm. The primary URL found in the document body, 'https://druttle.ru/wix?keyword=animeheaven+your+name', suggests a potential keyword-based lure. The heuristic 'PDF_SEO_LINK_FARM' confirms the presence of a mass external PDF link farm, with 30 links detected.

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://druttle.ru/wix?keyword=animeheaven+your+name PDF link annotation
    • http://bejegom.22web.org/kenobowuxuzaxunowubigegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_60293bde4f50c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5feddeec1c9e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fee2731a8c3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484605/normal_5fce562cdd539.pdfIn PDF document text
    • https://jareruko.weebly.com/uploads/1/3/4/3/134348829/romubizefojaj.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/sidK5ic/33423827558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415543/normal_60257660c1abf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_5fd646b99c43d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5fdae2f9ed577.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378607/normal_6002d41670903.pdfIn PDF document text
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/6b545cc5.pdfIn PDF document text
    • https://tilifopufobi.weebly.com/uploads/1/3/6/0/136049844/gidorazevopolure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujekikixew.epizy.com/poduzolikudabilagex.pdfIn PDF document text
    • http://xexitotikix.rf.gd/subokakejukirarag.pdfIn PDF document text
    • http://kuxadob.rf.gd/99783122365.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/97187211276.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_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 4868 bytes
SHA-256: 658ddbfb218ebf1768dde79b72d7141b7f056b5fcdf483e57486be1e4f124e83
font_01_sfnt_off00013ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE4 10476 bytes
SHA-256: d10a66304edc8077846216d984be26a7005998d1659cb8dd7ff2067b50722725

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