Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9163c45de44c40a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 15:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e791364410f7447c605d78486da8e9f SHA-1: 6cc9c0bd6e7d4af906e56c74b498c7004f5d5cab SHA-256: e9163c45de44c40a5c305ff53160d04c5c693f93ff9ef6f1db881d89bc37b972
134 Risk Score

Malware Insights

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

The 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 disposable hosting and a deceptive download button, suggesting a phishing or malware distribution lure. The embedded URLs point to various PDF files hosted on potentially compromised or disposable domains, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cleanenergy.mn/uploads/files/luzilifinaxanuzala.pdf In PDF document text
    • https://rjpexport.com/files/melojejuwojibubef.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/gebevijukatanukeludaju.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/52977053516.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/rowanutegobutew.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff99da660a---36765939699.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/19433762033.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/98639691271.pdfIn PDF document text
    • http://alltechsro.cz/files/lujulewuvepujegijeji.pdfIn PDF document text
    • http://epplast.com/files/file/tazabiwavebulobinuweji.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/61969299854.pdfIn PDF document text
    • http://maxbrio.kr/files/files/5154149368.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/86889496207.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/2476442984.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/fijadikiriverepemuwe.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/8751803166.pdfIn PDF document text
    • http://chenruichem.com/upload/files/ninonexuzadukiwukugava.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/36544536311.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613511ce398d3---90165584032.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/78609943564.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/sanidukepugubi.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210901_D330EEAD3548A474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nba+2k17+psp+iso+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 17984 bytes
SHA-256: 47ff6f2403ed591c73d369d453ecc5e559e7dd118affea4c85f4776ea8d2edc3
font_01_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 10572 bytes
SHA-256: fba1aea69950cd3962237cd93f172b38e05bda36c0ddc2d06ef69072205a5357