Malicious PDF — malware analysis report

Static analysis result for SHA-256 922bd18c64521c16…

MALICIOUS

PDF

97.8 KB Created: 2021-09-12 02:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60e0ed8b7526afae4f180220a496e447 SHA-1: 3d5c4c29cab5ab8c0282a62c76f39f0c9f561ae4 SHA-256: 922bd18c64521c1654934d9f8601ba4226221c8351a63fa0d969a4e729c94974
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://philabc.ru/uplcv?utm_term=windows+7+home+premium+to+professional+upgrade PDF link annotation
    • http://wsm.hk/images/files/sogasodegixep.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/af62fd8b9d7cf3eec493eded313673a2/fubisorafoseve.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6d39ef6b---wimerebowovi.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/niminugex.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/fekemopetidu.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/boranagewomavejopu.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210907_D08EC6975F7B1E3F.pdfIn PDF document text
    • http://viettruss.com/upload/file/viwos.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/vawirodozoxoledilebis.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/21232349345.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/dupuregagepigeva.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/37425158413.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/59299115300.pdfIn PDF document text
    • http://dongphat.net/upload/files/92623164462.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/76727978148.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/boteduro.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/nazuxuput.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/3290313001.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/jawilaf.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/8494921264.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/tulinefilupijipamamono.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/nobemegosafewesef.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/4098271770.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/getiradeza.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/nobives.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_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13153 17688 bytes
SHA-256: d025f97bbf9846b2316612a975f15d55d619008fcfa73d7ba58814980b77f4a5
font_02_sfnt_off00015f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F16 11172 bytes
SHA-256: c2b0a83d1beb8cdb5ed3b6aabe09b0fd7c057377cad93e3f55abd5bc09771991