Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2987b64fc102c3…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 19:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d957f975b8ce3d1c6cb941c46a032f4e SHA-1: 685295eca52296a935e02a6ced76fb244a418e9b SHA-256: 6b2987b64fc102c30a660098d983cdc376da30626f7282a1bc6d4c96f3ec4a48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains. The presence of many distinct hosts and the 'utm_term_redirector' flag suggest an attempt to obfuscate the true destination and potentially distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://observatoire-omic.org/documents/file/67725977961.pdf In PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/lenovaviko.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/kamewilematewovexox.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/jovifa.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///95364226047.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/lazekajoditamuwatuzizinu.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091901030749.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210904_37533B45B035C3C8.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/98684952257.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/31700623485.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/zadonavotop.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/kuzopufazud.pdfIn PDF document text
    • http://prompol.com/media/file/36681095824.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd32ba4da5---silawejubidupomob.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/34007808879.pdfIn PDF document text
    • http://petrovaskola.sk/userfiles/imagefile/56968135310.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/41508285917.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/77688236930.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/66336240506.pdfIn PDF document text
    • http://nensi.si/upload/file/samave.pdfIn PDF document text
    • https://mmtours.si/uploads/10438405737.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/zigekazojelarabo.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/benovovi.pdfIn PDF document text
    • http://nineslash.com/user_file/file/36163101754.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/gebobuwozefowapivenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mejores+juegos+para+android+gama+mediaPDF 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_off0000b040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB040 15092 bytes
SHA-256: f2d0bff60ac155582a359710aa870dee2efaf980462aad2d6f04d639fd732bbd
font_01_sfnt_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 10816 bytes
SHA-256: 41af4cbb3a80a87af5fbba469814e2978cbe761465622a5543504b3a27169085
font_02_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1