Malicious PDF — malware analysis report

Static analysis result for SHA-256 c251ae5726e004d9…

MALICIOUS

PDF

71.2 KB Created: 2021-09-13 01:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25a7b3092aed2c1750c7e7ac49bbfef2 SHA-1: a91de142bb8ffa07c596723df1660cf39f443b41 SHA-256: c251ae5726e004d94c83e3f989180fe0a39eee7d37a62b94a839945094a755ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ariaparvaz.com/basefile/ariaparvazcom/files/pawurikarudukenajazolop.pdf In PDF document text
    • http://mizuho-co.net/file/ck/files/51283319673.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fe5112b38d61536ff501010af813a1c3/38399192508.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/12002095645.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/90296084229.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/10872766915.pdfIn PDF document text
    • http://jump360.co/upload/files/20210901074637.pdfIn PDF document text
    • http://taociren.com/upload/file/210904215034400126lgm38v483x7m.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/mujajenutewowujirafozetu.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/3967596195.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/90376079590.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/mabemikapagapelutupabep.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/soridatumo.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/74743213522.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/tilupivuzodubajazaz.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/ligagowag.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/94799668754.pdfIn PDF document text
    • http://erimti.com/userfiles/file/jurunelulanufedagovo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd03dcb57d---44185622658.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/78238162806.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/87282145365.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/25950878619.pdfIn PDF document text
    • http://www.puhito.hu/uploads/noveboburesupazarofe.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/10761582507.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/8684807675.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/xadebozilulukepebis.pdfIn PDF document text
    • http://laduses.nl/image/file/35298526011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bohemian+rhapsody+full+movie+streamPDF link annotation
    • 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_off0000b4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AA 11096 bytes
SHA-256: 2d59e5911801d60a880aef1155d636d0851ad012dc92eb7fff9fcf90750d5f54
font_01_sfnt_off0000ce5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 16444 bytes
SHA-256: d28343380c1e1207f3884b76d4dc0f80877f05235b8d440209ff81751f9e1ab0
font_02_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1