Malicious PDF — malware analysis report

Static analysis result for SHA-256 39542a828050c976…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 19:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 073dd662a2042f24a79c7d5f1fdb7200 SHA-1: 5014eb1c86f13c38a2cab659294caffa596c5dc6 SHA-256: 39542a828050c976b71b3882e543b43dfdc2e9b5ef3e0770335d4a07292c2f17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, likely to distribute malware or phish users. While no scripts were extracted, the embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://stollerco.com/testingsites/advantage_aviation/assets/media/file/linebiwurexifulewibumanu.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/88181747144.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/38638071384.pdf
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/rurufesikaj.pdf
    • http://aaaexpressheating.com/userfiles/file/1951566548.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e149e3ec3c---nexuked.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/timivono.pdf
    • http://tonghuichem.com/upload/files/33739794629.pdf
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/vubotawavowetas.pdf
    • https://bikeid.net/ckfinder/userfiles/files/23974600407.pdf
    • http://theurbanbazzaar.com/userfiles/file/fedura.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe95393382---topumo.pdf
    • http://gusanhightec.com/userData/board/file/35613384364.pdf
    • https://eastmanllc.com/ckfinder/userfiles/files/rimozatozetikugowejixenuz.pdf
    • http://infiniti.e-library.tw/uploads/files/rewatitono.pdf
    • http://okgwa.net/50/files1/file/vejimadijilinafajajagaz.pdf
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/jirujuzafafive.pdf
    • http://topmebli.com/content/xuploadimages/file/30372050600.pdf
    • http://studiolauramoschini.it/userfiles/files/17689280998.pdf
    • https://piphoto.tw/uploads/files/202109031916301638.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/41823725451.pdf
    • http://wojno-stal.pl/pliki/file/rafasega.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///bovifir.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/nbp1ao1r9u6jrtcqspv223hq16/63736258920.pdf
    • http://wuxihemei.com/ckfinder/userfiles/files/20210901_212000.pdf
    • https://bharatceramics.in/ckfinder/userfiles/files/13041736329.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=porn+apk+free+download
    • 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_off0000dc09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 16792 bytes
font_01_sfnt_off0000f41b.bin
97f7b995687fd6531710b7dd0d33676bb4f618283691c0404565db6dc12b5dd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 18336 bytes
font_02_sfnt_off000123e2.bin
a3e31ac942d43632188d339f154fa6c644df7ec2418bd80184437f32b1e39851		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 10312 bytes

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