Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fc15df64657863…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 22:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: affac6f3ca7840078a4214c6cde15c73 SHA-1: 5c2e707773a419f1626e8d27a3c8adb6308a6204 SHA-256: 65fc15df646578636f225f223f7e811f0ec1c2aac565b566958981d0b0c43753
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, suggesting the PDF's primary purpose is to funnel users through a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=hello+caller+tune+app PDF link annotation
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/79524186796.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/tesovisoputetajokal.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/34546687443.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/baratotat.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/gukelur.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/gofoxuxavaz.pdfIn PDF document text
    • https://miet.hu/kepek/zopumomosagivetis.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vewivupegenafafifixo.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/73128128161.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/40255036466.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161400ac00bb10---jegifomef.pdfIn PDF document text
    • http://showdoimovel.com/files/files/rolunodulekaroselomesulew.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/68130295999.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/33947267766.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-17/20210917012612382120.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/70744819492.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/65410097292.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/78838486250.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dojukogadidabuz.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/52836388565.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_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 16888 bytes
SHA-256: f5ad410d5b7e35066147bdda2993bb0a20c492fb6cabd7df655bd268b429eec5
font_01_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 10196 bytes
SHA-256: 875ce9b42059583f2c1186e024b8a0a0dd6d8c46a55282aaa975b0eddde48c5e

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