Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5981c160f4be9f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 06:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b35f318b9730d5c7d1dfbc5b031ae680 SHA-1: ad169dd928175e6d026fbda4a10d8089e66c46a9 SHA-256: dc5981c160f4be9fa032f008643091bb08be10db96f3347ba89d12bcdebbcc9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://barrybusiness-crm.com/ressource/devis-photo/files/bomizuwetotefu.pdf In PDF document text
    • https://weeb.nu/userfiles/file/72933103290.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/50470539207.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/53829702745.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/mumaz.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/14840508282.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/63606957510.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/39017927352.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/j8o7i9mrs25gfr5uclvkfni291/mifudepobelimola.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/81381688516.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/27916981577.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/27929249227.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd84bd0add---sunewow.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/17447573251.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/pumixelijazawagobekez.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/nevetoxegoniremido.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/jenifurexudobalubexisit.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/3850682838.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/40822923674.pdfIn PDF document text
    • http://seritour.com/rsm/files/30571415469.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210908031533538.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/32501106221.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/tukororegozusarurifise.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/salarubatekigukat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tap+titans+2+mod+apk+free+shoppingPDF 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_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 11072 bytes
SHA-256: 8dbc95e8b731fa0c221988bca87646a83d3b6077e7e5a612b6c4973e8a1e6659
font_01_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 17056 bytes
SHA-256: 529027cffeea81a73c6db89102acb81880649b78f6b39416d4f32b2458b47633