Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3399301da828c98…

MALICIOUS

PDF

69.9 KB Created: 2021-09-15 16:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cae26b6ab5a105593dbea085f6f152f SHA-1: 4f3f4fc85df4b90403a8f46ded04b8fddc2e20a9 SHA-256: e3399301da828c9804b3f3f1d200f0ea038085a8e91d99621e42d30ed94e403c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many of which are linked to disposable hosting and appear to be part of a link farm, suggests a phishing or malware distribution campaign. The 'utm_term' parameter in one URL indicates a potential attempt to track user engagement with a lure related to game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=the+room+game+download+for+android
    • http://chono.mn/uploads/userfiles/files/sefutipogusuxusizim.pdf
    • https://weldingportal.it/userfiles/file/85428698866.pdf
    • http://uforoi.com/app/webroot/uploads/files/xakevakutazukedifesupegi.pdf
    • http://opsir.eu/files/file/56582825060.pdf
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/50279222523.pdf
    • http://keyseries.us/userfiles/file/teparopuroserixowobofiz.pdf
    • http://cross-winds.in/upload/contents/images/images/wabisedipesa.pdf
    • http://rpsbchamber.org/editorData/file/digazajoze.pdf
    • https://patriciobanados.cl/upload/file/
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/pifepaz.pdf
    • http://molenat-energies.fr/molenat.com/images/editor/file/73666943459.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/33419163ec3d8eee79d42625085caf3d/sivivixo.pdf
    • http://chinazzjx.com/d/files/33025452027.pdf
    • http://minhnguyenvn.com/uploads/userfiles/file/kuvigijusigubafujoxoxivut.pdf
    • http://uforoi.com/app/webroot/uploads/files/lujikosu.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/18951812762.pdf
    • http://deshdunya.com/blogimage/file/xajorura.pdf
    • http://smartdeal.pl/files/upload/files/mojujowunuborutavewatu.pdf
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/govavubovamuboxezedujulum.pdf
    • https://bwhe.in/ckfinder/userfiles/files/3771081650.pdf
    • http://cssh.es/img/file/86745571547.pdf
    • http://mobiliteit.nu/files/zulozexuv.pdf
    • http://mannaz.pl/userfiles1/file/4112240132.pdf
    • http://ryukatsu.com/userData/board/file/18156315343.pdf
    • https://samsungklima.net/upload/ckfinder/files/96369945429.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_off0000b449.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB449 16792 bytes
font_01_sfnt_off0000cc5b.bin
f4585fd1a8289be25e6207a8606d4561bca778b7986da966cac4f9ce8faf2762		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5B 14976 bytes
font_02_sfnt_off0000f239.bin
12f5b07e89640e596278290213cb9c7ce903c2e136f8e39c304cc6def6afda2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 10584 bytes

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