Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf75ee06d69cf8d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 03:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb53c26e98f405881f52a906136e2414 SHA-1: a3872f149ed8e87f93fde312ace295e5b6abe376 SHA-256: caf75ee06d69cf8d1f43c0579d8720fcb8d3205d2958ccf9ed5ed6334994332e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating the presence of random and disposable URLs. The PDF contains numerous links, suggesting it functions as a link farm designed to redirect users to potentially malicious content or downloads. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=among+us+menu+apk+2020+9.1
    • http://alacarte-design.de/userfiles/file/4124739012.pdf
    • http://safiorida.nl/operatori/userfiles/file/74907481178.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/66904324867.pdf
    • http://veganogle.es/uploads/ckfinder/files/wenalisis.pdf
    • http://uforoi.com/app/webroot/uploads/files/tijusuf.pdf
    • http://netmutum.com/userfiles/file/lomubo.pdf
    • https://haisanquangninh.org/data/dulieu/files/34218920983.pdf
    • http://tianfonmm.com/d/files/95958320770.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/bipigabob.pdf
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/tinakizora.pdf
    • http://mmbc.cz/_data/user_files/file/liduxurisuvuvazalujemog.pdf
    • http://www.bandungmesin.com/file/21090547368.pdf
    • http://syntrend.critical.tw/upload/files/88622059780.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/68406881445.pdf
    • http://kcntanduc.vn/img_duhoc/files/91003115142.pdf
    • http://ceomit.com/fckupload/file/mowofaruwojevakut.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422555302ea---wasulinimodimagosatunega.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/rexevapot.pdf
    • http://co-wemart.com/careeruserfiles/file/sigavajadetiranutidaxi.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/64076107648.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2bb8aa9b2---metimaxanufilezidi.pdf
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/9417471092.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0d8.bin
7c8d99413075a5e44129bff24519a583d468f95dad6023c2c6b2ac5377204731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D8 18004 bytes
font_01_sfnt_off0000def5.bin
9ef7429c30cb1616d8311868ee2efc5db0b101c6d339f183f9bb46cda6004132		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 10960 bytes
font_02_sfnt_off0000f887.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 16792 bytes

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