Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce0c079f5e0e43f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 12:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f152834ffd6921dd65fcdbbdbeee00a SHA-1: 4edf6dfbe86c02e2ac0c63d48c2064a26234e2c9 SHA-256: 7ce0c079f5e0e43f258dc00100038518cad4c4d8d185af9858d8ecb870c4d1a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://almuhja.com/ckfinder/userfiles/files/88071773439.pdf
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/dirosoxosak.pdf
    • https://realxenon.ru/uploads/files/64906299116.pdf
    • http://geopraxis.it/userfiles/files/povup.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/gimixexutogewome.pdf
    • http://yasaitogo.com/uploads/files/23388553375.pdf
    • https://hw-power.com/uploads/ckfiles/files/613d4e3b325fd.pdf
    • http://anael.fr/fckeditor/userfiles/file/fejuletozijujututafubita.pdf
    • http://giaydantuongphongngudep.com/images/news/file/rogudiniki.pdf
    • http://w-f-l.de/user_img/file/sosojuzafoveko.pdf
    • http://bk-plus.at/userfiles/files/besojedibatubox.pdf
    • https://malashealthcare.com/userfiles/files/ginirudosotose.pdf
    • http://studiomarcheluzzo.it/userfiles/files/47881165904.pdf
    • https://mayphotocopydogia.com/upload/files/sutimalebemamu.pdf
    • https://ysh.my/userfiles/file/niwitafu.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146ec9536a0d---275830087.pdf
    • https://efsanepin.com/calisma2/files/uploads/mubudukinowutimonilekikis.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/88034280876.pdf
    • https://travellifeafrica.com/ci/userfiles/files/wenabebajotunofokixagule.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/81321170832.pdf
    • https://dawnraytech.985.tw/data/file/userfiles/files/xirelabanadesabajubiwon.pdf
    • http://capthepcongtrinh.com/uploads/news/files/xomanop.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/4971752871.pdf
    • http://xn--d1achljw0b.xn--p1ai/content/upload/jinijejinisida.pdf
    • https://windfreeklima.com/upload/ckfinder/files/kovuwotapox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=bajar+peliculas+android
    • 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_off0000cee2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 16792 bytes
font_01_sfnt_off0000e6f4.bin
a60949e7f942e462a54c2db5011a92141f8578d1ba4df789ab6ba9cbf63832ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 19192 bytes
font_02_sfnt_off000117be.bin
ffc1ca5982d64af76d6144cdb9e1cbb31f49b6a2b709a73e6e44173af3ad88bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 10692 bytes

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