Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bc36c3045d9695…

MALICIOUS

PDF

67.7 KB Created: 2021-02-14 17:25:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d781e1be0b91042163c874f60983f43c SHA-1: 6437aab5ee8c96fadaef2a934cd77b0d4f1a8440 SHA-256: f8bc36c3045d9695c83df85f116e39420f8c5f702cd0fbeaec85aeb9526e51aa
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic to redirect users to malicious content. The embedded document body, though heavily obfuscated, contains a keyword that appears to be used for SEO purposes.

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://seumenha.ru/wix?keyword=minerals+that+contain+carbon+and+oxygen+are+called PDF link annotation
    • https://cdn.sqhk.co/puxedimuwo/gehbiem/46777787534.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/5070182.pdfIn PDF document text
    • http://novinove.iblogger.org/lagu_lily_versi_bahasa_indonesia_smvll.pdfIn PDF document text
    • https://rixowumunek.weebly.com/uploads/1/3/5/3/135330445/5139690.pdfIn PDF document text
    • https://ginufadep.weebly.com/uploads/1/3/4/6/134668932/sijojemudu_bokamejam_tokozugorad_kevan.pdfIn PDF document text
    • https://rijadotijijani.weebly.com/uploads/1/3/4/4/134470018/xozidusolorasuk.pdfIn PDF document text
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/c24d0730e20fbb1.pdfIn PDF document text
    • https://pabametutib.weebly.com/uploads/1/3/5/3/135317572/4382525.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/468e8ca0562934c.pdfIn PDF document text
    • https://lewumirobubav.weebly.com/uploads/1/3/4/7/134762292/liralolubitomi_surijobajotuda.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/lakotukesu_gomifajex_mokepulugab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buwozefavimim.epizy.com/anemias_carenciales_en_pediatria.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_off0000cbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 5516 bytes
SHA-256: 93472c9c7c87d69075854cd549b589ab9175c6554956574b9c5dccf2f8fdc663
font_01_sfnt_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 10388 bytes
SHA-256: 0e9eb624b5cb3a7bb6b3b8c71e1332f5df28b40cfcbd0e123a7e236b42be40c8

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