Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d59fe6d99e2ac7…

MALICIOUS

PDF

70.3 KB Created: 2021-09-20 14:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e267e67ec0a5f35a18a42bdd268341a2 SHA-1: 63449e5ae045e933e4f41ca4e1eaea2ab59f642c SHA-256: f2d59fe6d99e2ac7af3ce3fe637b03e0acef1b0c283b541890801c43d3abf837
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and a redirector pattern, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://tzoetemondje.be/uploads/files/bosibesobura.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b337605b2c515b26a3a595f3d8229e5f/labanixojiwitupuworeril.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/luligobexixepuguwiwu.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/13420529369.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/36561985713.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/2051215117.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/nixipaguwuzoropowu.pdfIn PDF document text
    • http://exima.kr/userData/board/file/93235996276.pdfIn PDF document text
    • http://fructusartis.com/i/File/juguvevokanuv.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/zuxuferavogokarazesunu.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/pewidulowumopitafem.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210919145304.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/tewumozinisut.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/vedazur.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/kirazosenusupusi.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61750647660.pdfIn PDF document text
    • http://okun.su/upload/file/84613774973.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/popokuxepopepidaperadubaz.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/20702172772.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/62832698809.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/55721558131.pdfIn PDF document text
    • http://theponghop.com/upload/files/23363351828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+app+to+watch+live+tvPDF 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_off0000b26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26A 16368 bytes
SHA-256: 7c305e9717ba626f4f3aa3b3a6a910b33f50b88db403c03f9a0bc4addd15488e
font_01_sfnt_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 10472 bytes
SHA-256: b41c9a5c5e2e4aa9bb34de75863395c4f8f90c4dc9945cda05e1850c5cd75699
font_02_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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