Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63d9d14c7f2ca17…

MALICIOUS

PDF

70.4 KB Created: 2021-09-23 15:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18e37c87f6c569ee654e7702929337c7 SHA-1: fb80f8233233cafb5b7d2319d0eeea23e4939cc3 SHA-256: c63d9d14c7f2ca178ffbafd498aafc29273b9c6f67dea18e77d7620c71521006
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs pointing to disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=johnny+english+reborn+tamilyogi PDF link annotation
    • http://maraulsan.com/ckfinder/userfiles/files/supogadubuwonewakoxiregud.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/fanovizisekajifel.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/80502401673.pdfIn PDF document text
    • http://kasand.com/userfiles/72103088354.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/42921045294.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/firunofodemulijewetufa.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091416483173499.pdfIn PDF document text
    • https://andana.us/files/files/lejuruxorudokup.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109101044099444.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/33296578316.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/gotoxurubajexawovinivaki.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/debuxekefanifupijagawil.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/46688000853.pdfIn PDF document text
    • https://webmenuplus.com/images/file/rusevolelofitujule.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/52435063653.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/zeravosuwavoxoku.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/wupakotob.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/37438776465.pdfIn PDF document text
    • http://lj-group.cn/upload/files/90986050286.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/7799588042.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/fovuwipa.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/75743316489.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_off0000b054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86B 10800 bytes
SHA-256: 5868dbc9fa0e52c0e97bac643e6155f9c2a7e6154f5c611ab9e6de4ae125e7ca
font_02_sfnt_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 16692 bytes
SHA-256: c5060122dde391ecf75280c6fa729afc7f3824bb32f6803c4ff942b775b109dd

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