Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a72c49cc1bc711a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 19:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52b754046a50ee56873ac654a7612807 SHA-1: 3dd60a2f8d758fde4fde451d850391159635d227 SHA-256: 2a72c49cc1bc711ae4aea1ecb7db9ce6039f781a8d04a40514e1591af78f6ed9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers as malicious. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery information, such as private keys or backup codes. The presence of numerous external URIs, many pointing to disposable domains, suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://myoffice2561.sesao33.net/UserFiles/File/gojawog.pdf
    • https://nevisnews.com/userfiles/nemabumumezezawegiwi.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161391a0258a77---daweviruwumoderibi.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/mixonedenikodiro.pdf
    • http://zhengfutz.com/v15/Upload/file/2021911518185323.pdf
    • https://truonggiangcompany.com/userfiles/file/35288559172.pdf
    • http://patp1ryb.ru/media/file/1696844001.pdf
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/9504575654.pdf
    • https://mkontakt.pl/dat/file/51537739183.pdf
    • http://odessawa.com/userfiles/file/mazegotudipajogatiru.pdf
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/84165442856.pdf
    • http://elisa5888.com/shopadmin/upload/files/guludig.pdf
    • http://ctcinsulator.com/uploads/file/78661262435.pdf
    • http://jljemc.com/upload/files/mabuto.pdf
    • http://01host.ru/userfiles/files/miluturilemixetipemiw.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/96321703148.pdf
    • http://chinalabware.ru/d/files/59220495325.pdf
    • https://semut73.com/contents/files/segek.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rdcc53l78j6dti2lp7hkttsgcj/tixuforulawitavopo.pdf
    • http://mansiya.com/uploadfile/files/58883946266.pdf
    • https://glamweddingdesign.com/userfiles/file/56061406204.pdf
    • http://freetourscadiz.com/ckfinder/userfiles/files/serutafomenipewizofepe.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/jojusebiverunep.pdf
    • http://kfoodntea.com/dataroom/file/vimudobudipebov.pdf
    • http://texmet.pl/userimages/file/71156579649.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=device+setup+apk
    • 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_off0000ced4.bin
0d908e53ed01638f5386971fb2156d5a8b18106f5ce5c870184e310e38c3efcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 10256 bytes
font_01_sfnt_off0000e627.bin
5b8925040d779a48f5287c21bc54a31bb5175e6c6696602f7982bb9bef480a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 17028 bytes
font_02_sfnt_off00011254.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 16792 bytes

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