Malicious PDF — malware analysis report

Static analysis result for SHA-256 82007c218d413473…

MALICIOUS

PDF

85.6 KB Created: 2021-09-23 11:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31e7aa70b87bc92876119c5f05575b2e SHA-1: 87c0b492c490c9e702c70c2b23e9c4434f0b847a SHA-256: 82007c218d413473ce580e6390f7dd7f8deaff2f20d9586efb3e84997b2e15d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs pointing to potentially disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious sites, likely for further compromise.

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://krisoc.ru/uplcv?utm_term=android+phone+activity+tracker PDF link annotation
    • http://saatgaamkansarasamaj.com/admin/uploads/files/15249555611.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161328ae116ad2---xofinisutot.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/lemoxatete.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/91428907668.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/89143766306.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161308fe3bd94d---82999700891.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210905001437.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/befutakapasijumubol.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/25598224955.pdfIn PDF document text
    • http://hiniceshine.com/upload/junonoxojuribejutino.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/sepovejefokivozaw.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/regejimidibirot.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/63900886009.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/35310665736.pdfIn PDF document text
    • http://dobermanncz.eu/files/kadonojuvefela.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/majajenemarekazexomo.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/pabirasezovuxifaxeveg.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08f8aecbb---73791021227.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/dikinubiviferotaxuzobule.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/53945978450.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/jepiburiximolekatep.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/5952154759.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/82584621774.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/3743473557.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/53270823404.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_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 17620 bytes
SHA-256: dad477a7f04c4a7c6bac4ea45084ccd43db9daafc4ec04757c05cfffe54eff6f
font_02_sfnt_off00013078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 10648 bytes
SHA-256: 95aa40ce56761a89ed84b460ec3ecf6c6b80216ab959e666d517937df3cf1eaa