Malicious PDF — malware analysis report

Static analysis result for SHA-256 845533078e0ac34e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 23:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 34257bd4cf82ac0d68fc24cfd192c70e SHA-1: dd44fc68a142db6df6868cf225522e0bcad7eed7 SHA-256: 845533078e0ac34e92ec908a691edc41f481f22d7106c6998b26ccf7fbca0be0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs pointing to various domains, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thuaphatlaihoanghuy.com/uploads/files/62807019324.pdf In PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/45679666270.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/99525850047.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/21222042855.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://telekommarketing.com/firme_data/files/44996456982.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/19834083030.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/4653278850.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/91282852633.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/xasopezesukazujatiwaxul.pdfIn PDF document text
    • https://matricula.arendic.cl/files/44051831661.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/jasoke.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/vimobeliwaj.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/45097814669.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/diriz.pdfIn PDF document text
    • http://mimpishio.com/contents/files/30331474705.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/sirilazivukakivawo.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/pexixemitovulasopojasid.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/af1cc3ea05fdec69c7998bad29d8ad71/winikodajezivatowane.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/narikaruzuku.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/68448370748.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/39995291207.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/84999516213.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/virepanudaruwabezidibari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=car+logo+quiz+answers+level+2PDF 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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 10796 bytes
SHA-256: 75a84de0faefd6537c9fe627664b39653b84e5f329d89dc256a9c90884fb4e13
font_01_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 20264 bytes
SHA-256: 66ce48092e6940e5444c80462f7d9e3fdd0a9aef05c1c087012c9705878a4ea1