Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bef93bcb8479fe…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 17:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4eb922f680c576f74daf643c1ec84fd9 SHA-1: 71f919ed188f190f2d3268906463bef4e5fe793c SHA-256: d7bef93bcb8479fefeab44e4e2374cb5821bda91f2ecf273bd775fc3ecc76575
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users, suggesting an attempt to obscure the final malicious destination. The presence of 'utm_term=download+forza+horizon+4+ppsspp+file' in one URL suggests a lure related to game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gamedunyasi.com/calisma2/files/uploads/wevesasomaxuvenegojido.pdf
    • http://filtrydokoparek.pl/img/all/xobukaxelixopejibuwafed.pdf
    • https://www.tvmreza.tv/ckfinder/userfiles/files/32400065927.pdf
    • https://dampinggame.com/calisma2/files/uploads/fikabitonunetasef.pdf
    • http://sisparts.pl/zdjecia/fck/file/83883531847.pdf
    • https://varida-tech.com/ckfinder/userfiles/files/numokesakuf.pdf
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/zafikekudutitosetubamiz.pdf
    • http://kirilmazbardak.com/userfiles/file/wafanowujezudubexasuraguz.pdf
    • http://thai-apsproducts.com/file_media/file_image/file/44382312848.pdf
    • https://innotek.vn/uploads/news_file/seruzukudamibapev.pdf
    • http://indago-rovigo.it/userfiles/files/98163383693.pdf
    • http://airzo.net/userData/board/file/96308704003.pdf
    • http://elementsgogreen.com/userfiles/file/xufisamegodola.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613818d7001c1---94208802500.pdf
    • http://fpempresa.cen.es/userfiles/files/71699140214.pdf
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/nofopotusalo.pdf
    • https://srmhomes.com/images/bulk_images/files/33563774175.pdf
    • http://alocainghien.com/uploads/userfiles/file/wemubobefitowe.pdf
    • http://dotykbylinky.sk/_subory/subory/tixofogilazujej.pdf
    • http://associatedreclaimed.com/userfiles/files/3539915740.pdf
    • http://odra.cycling-recycling.eu/imgturysta/files/20398893683.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62393043038.pdf
    • http://bhartiyambeohari.in/userfiles/file/64787154777.pdf
    • http://madinaboys.com/easydo%20v2.00/files/uploads/monisopev.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+forza+horizon+4+ppsspp+file
    • 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_off0000b2a9.bin
8761db94218cb72f060f0488524b0a836880e10c1b305896db9b23597fc8ea91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A9 10724 bytes
font_01_sfnt_off0000cb49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB49 16792 bytes
font_02_sfnt_off0000e35b.bin
a7e1e1d651c02b3d29ac993cc3c688d1785d086902602ca9ebd57663f50f5a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 16076 bytes

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