Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83064dc7763d7f7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 09:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbd387edab8493dc6afeb6e69d5ce52a SHA-1: 40a1d0433753508a6318d92d1bfa2b478d6b5cca SHA-256: b83064dc7763d7f73351c0e3a1d95aeabffe6ec6e0f27165418dd308965f85d9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, including one pointing to a potential download lure, suggests this PDF is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic of using numerous links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=download+naruto+ultimate+ninja+storm+5+ppsspp+android
    • https://soi.icami.mx/ckfinder/userfiles/files/10074708487.pdf
    • http://asavn.vn/uploads/userfiles/files/wijisaliv.pdf
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/wemefoneroz.pdf
    • http://bet-balance.com/userfiles/file/53171538622.pdf
    • http://proclima-membranes.ru/userfiles/file/51731478210.pdf
    • http://bobas24.pl/Upload/file/46043899687.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/bosolat.pdf
    • http://belly.bpv.su/content/files/files/49772951958.pdf
    • http://simsoncantho.com/userfiles/file/boxufifuxuwukiluk.pdf
    • http://achwvs.love-mrt.com/upload/files/ravetatokenisupumu.pdf
    • http://www.likoda.com.tw/upload/ckimg/files/kovuzobowotiti.pdf
    • http://axi-hohenstein.de/userfiles/file/fugimeku.pdf
    • http://ahdjcm.com/upload/files/kenexolamo.pdf
    • https://virtrade.gr/userfiles_lybo/file/tusarebufominoxo.pdf
    • http://medwin.kr/userData/board/file/goxuxozorofu.pdf
    • https://softwebstar.com/shop/userfiles/file/47751236497.pdf
    • http://lor-rostov.su/userfiles/files/87015258304.pdf
    • http://zhuoer.ltd/userfiles/file/bupurureja.pdf
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/vozoma.pdf
    • https://fundacjaartfreeart.pl/userfiles/file/71271345168.pdf
    • https://weborder.cloud/userfiles/file///48742409243.pdf
    • http://vsrru.ru/userfiles/file/fumeworaxa.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/sh1fefhqjrriec70ffbpl18mgd/14043359475.pdf
    • http://www.findvoters.com/userfiles/file/21706291618.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03d7364c0---32219983125.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_off0000dd0a.bin
984d5427e6e259a82bffe17a484c56d3caa39c9ef2a3be5b6f975c3432c9ea46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 11004 bytes
font_01_sfnt_off0000f6a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 16792 bytes
font_02_sfnt_off00010eb6.bin
7415f8158cc28869857e1e6831c58bf05d597c4ff638299f9d9c02fb80e772ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB6 17600 bytes

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