Malicious PDF — malware analysis report

Static analysis result for SHA-256 890bf4249e875d17…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 09:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 619bc7d4d13ed7fe91b48a81dd14b006 SHA-1: c539007a899b3d3af4094557f5527ae9a9328950 SHA-256: 890bf4249e875d1751a57f96c12e64d17c5e400448fb8f3829b56592596069eb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm heuristic, suggesting it's designed to host multiple download links. The 'Password-protected archive handoff' heuristic indicates the document likely provides instructions to decrypt a subsequent payload, a common tactic for evading initial security scans. While no scripts were directly extracted, the PDF structure and heuristics point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hyundainhapkhau.net/upload/files/19734792258.pdf In PDF document text
    • http://tiquital.com/documentos/file/gelivi.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/vibaw.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/gadadusiritibifetesulipo.pdfIn PDF document text
    • http://riviera.az/userfiles/file/15196371899.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/tuvabawuto.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905070634.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/wilibiti.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/20oim55dildnfv8gck1b17iban/95113992173.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/85872228149.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5319d1237---58051415376.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/vifunozuj.pdfIn PDF document text
    • https://maria-galland.ru/files/file/nolimobuloxazakozel.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/fasagavebawokamiropexewu.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/jutata.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/xagogozogosuvopoxotu.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/33633764084.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/mawebenixile.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/56130989061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=vigyan+pragati+magazine+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 22328 bytes
SHA-256: 676ae6dccbd7a5ced2123e93290246873241f01d6501a064753bebd8647e489e
font_02_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_03_sfnt_off000131c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C8 10900 bytes
SHA-256: 43251f716d20b0786a3fcb79f9bae0f7405a268f6160125fc67ecc3f83b9a3ba

Open this report in the interactive analyzer, or submit your own file for analysis.