Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2b0328f01a34b4…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 00:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03a3c452962707ce0f3cc47afde8223f SHA-1: dedfafdcd7f8b64a5d64482bc0ec451c5f6a3a4a SHA-256: aa2b0328f01a34b4173e3df0e34f58eea1710e65d5a8a25df8f8a42217935874
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=pokemon+go+spoofing+pokemon+locations
    • https://steklo-shik.ru/userfiles/file/98999945720.pdf
    • http://eshop-kocicinadeje.cz/files/file/puxujesoma.pdf
    • http://batistar.fr/userfiles/file/67602898435.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/butiguzugakokitofuso.pdf
    • http://midospa.com/upload/files/resulutoj.pdf
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/37666964192.pdf
    • http://tysons-cafe.com/uploads/files/49148070897.pdf
    • https://glbtrader.com/userfiles/file/ragobazulexapela.pdf
    • http://bagodilovaspark.hu/userfiles/file/47347683853.pdf
    • http://nissanotogovap.com/uploads/images/files/losobasi.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2c4af0ee2---sunaruzo.pdf
    • https://kitchensofdiablo.com/upload/file/79493884781.pdf
    • http://abwninemile.com/uploads/files/fezubowexos.pdf
    • http://altronic.pl/!mag2011/userfiles/file/xupagivukujaran.pdf
    • http://brmhn.com/userfiles/file/20210908200405_01nnd1.pdf
    • http://nesthomes.in/userfiles/file/fajazirigagewesaveti.pdf
    • https://dortmundpools.com/contents/files/rudikevevi.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0cd0ba335bb3413765187a1442ea724c/salufezesasasiginif.pdf
    • https://santaclara.com/wysiwygfiles/file/4623915814.pdf
    • http://jsushibrea.com/uploads/files/89716395367.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/rabukekenunuperegoregit.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/47909370986.pdf
    • https://somogyplusz.hu/files/64606512024.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_off0000b730.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB730 16792 bytes
font_01_sfnt_off0000cf47.bin
08fa27aff61ef84f5d08d7b98a3bc2368476701a21682336187dc98a5b8c27bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 10816 bytes
font_02_sfnt_off0000e844.bin
7f9789f66e6673e760e1181083d7786bbb94b68c51190c6dba6f4da92e705a8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 16020 bytes

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