Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb31b7714c31cf3…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 22:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a59f3a3f37c7c23aa7dfaabbf5a98a2f SHA-1: 1fafcf64572f45c04e58c6844634b06f16ea8af6 SHA-256: cdb31b7714c31cf3661c67159d31e8eb0ac129723da579300adf3b9072ae832c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical detection for 'Recovery secret / private key request', indicating a phishing attempt. The presence of numerous external URLs, many pointing to potentially disposable domains, further supports a malicious intent to direct users to phishing sites. While no scripts were extracted, the document's structure and heuristic firings strongly suggest it is designed to trick users into revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://zhuoxinlaw.com/userfiles/file/20210911051139_682329620.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a16c0a984d073f2240836c5edc2ba329/midamizenutoxojasi.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33462822395.pdf
    • https://deepex.hu/hirek/files/5911845536.pdf
    • http://thietbikhachsanvinhhung1.com/upload/files/vepurokamerebixokujo.pdf
    • http://www.europesolidaire.eu/userfiles/files/78093232526.pdf
    • http://lamachine.nl/userfiles/file/49539512300.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/nawesumava.pdf
    • http://nguoigiupviec99.com/webroot/img/files/tafimubugejuvega.pdf
    • http://cappellastudio.it/userfiles/files/xisinudufupasugije.pdf
    • https://nurea.se/currency/userfiles/file/34048650570.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/8210697290.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1febea81d---82345240468.pdf
    • http://104408017.linker.tw/files/loxodunepogus.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/gijupodukelumefefu.pdf
    • http://ural-resyrs.ru/data/file/21616430846.pdf
    • http://topmebli.com/content/xuploadimages/file/28891365579.pdf
    • http://maihome.hu/admin1/file/vewuj.pdf
    • http://tabletopad.com/images/file/vumoxavivegesomisu.pdf
    • http://skolky.info/foto/images/file/9516753595.pdf
    • http://askort.pl/Upload/file/pazoloredazozozasilili.pdf
    • https://sarvodayasamaj.uk/upload/files/96526300700.pdf
    • http://zatoodesign.com/userfiles/files/pawatexonifasagibe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=seeking+arr+login
    • 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_off0000e56b.bin
17fa75e110a1e13f9584ff9127d1b8d9d3b1a2d3e2c0702f779c458d61a9da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE56B 18728 bytes
font_01_sfnt_off000116c3.bin
e4eceeca355e2e5030e847138c55ee12a7fb9a3cd583b22c57d391790dfdeb35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C3 10184 bytes
font_02_sfnt_off00012db0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 16792 bytes

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