Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfe6167a625a0a8…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 03:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3257b5a7ee52ec8dd6ee49fe76a7fa6c SHA-1: 46faa2c25636b85cc512e057b3b811f3a1bb3610 SHA-256: 0cfe6167a625a0a8379ce3ff643d0be21a211dd1648f6c721e103ae08599bce9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to a URL such as http://adance0112.com/upfile/editor/file/xajozazeresulopabumix.pdf, which is part of a link farm designed to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adance0112.com/upfile/editor/file/xajozazeresulopabumix.pdf
    • http://haliburtonhighlandsheritage.ca/userfiles/file/fafexijax.pdf
    • https://apotekatia.ba/fajlovi/16684661.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f372ebc705---vifusefodor.pdf
    • http://caydinhlang.net/userfiles/image/file/68232861365.pdf
    • https://bodegoncriollo.com/userfiles/file/poxatonenasakapepow.pdf
    • https://livredart.com/ckfinder/userfiles/files/33506622679.pdf
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/12759531700.pdf
    • http://katyababash.com/images/uploads/file/melojuwugadivus.pdf
    • https://acrgruppe.de/userfiles/file/12825885242.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/59713338237.pdf
    • https://nusamulticentralestari.com/Uploads/userfiles/files/65470215510.pdf
    • https://www.ijdsir.com/ckfinder/userfiles/files/94569736686.pdf
    • http://myphamnanyno.com/luutru/files/labun.pdf
    • http://ranch.pl/files/file/kotawowu.pdf
    • http://tamker.hu/userfiles/file/kazoponowopoxi.pdf
    • https://ddc-touggourt.dz/ar/files/momeladuwamugeperuwokogo.pdf
    • http://koreabulk.net/userData/board/file/pulesolizegagosamuxix.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322fbf516a4---50931364112.pdf
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/netidevujoxepu.pdf
    • http://timnhanhonline.net/upload/files/zirirusijo.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jafuva.pdf
    • http://metalltechnik-kutschi.at/26230021011.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=teamspeak+android+free
    • 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_off0000b0f9.bin
60adc2e49ba179dad18076aa83a2531341001e0abd297156420bafda439e7381		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F9 15912 bytes
font_01_sfnt_off0000d850.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 16792 bytes
font_02_sfnt_off0000f067.bin
521fa0010b0c7263facdfb52f66740a9a4870d18bc1b2652013bf16352207778		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 10568 bytes

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