Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd0a6ae287dc881…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 11:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61190d8675aafc819cc78994583a7c11 SHA-1: 895ba801037ba2d48e3b6f0f2f0591f6cecfebbb SHA-256: 9dd0a6ae287dc8811ec1c702da6d5caf603d4e3b21a77d664fd175776e530abf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, suggesting it functions as a lure to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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 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://infrive.ru/uplcv?utm_term=application+radar+mobile+android PDF link annotation
    • http://mapect.com/upload/fckeditor/file/tulegumujinev.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/sisew.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/govag.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/10640725021.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f872aa3f46---25572274087.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/21141261187.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/vatov.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/sobinewuw.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/9111119211.pdfIn PDF document text
    • https://hsse.cl/files/98529828260.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109051837127707.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/virosuxive.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/54014770146.pdfIn PDF document text
    • http://dakmet.pl/upload/20631373691.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/gegetivuv.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/sipidokusarofiw.pdfIn PDF document text
    • http://888chji.com/userfiles/files/5318179434.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/funanojubabejabitezu.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/67561832956.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/54752200626.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/13388463839.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613428eab66db---15020238161.pdfIn PDF document text
    • https://music-group-store.com/upload/files/fozatodakumevoruguweta.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB607 10628 bytes
SHA-256: a593e1cad1d140b494ee0180804d9c5d79cf6ec6a7150ebc1f7bb49fede8e314
font_01_sfnt_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 15716 bytes
SHA-256: 73130b326dc1701a600e01e1655c836829db0f31f830ad75a80761ab3e9ba45b
font_02_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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