Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcf7992841442b0…

MALICIOUS

PDF

91.5 KB Created: 2021-09-24 12:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1c04e6158665efa402fdedd101f79f8 SHA-1: 543dd5e0f14cace5e6e58cf01a20ac676b92eb93 SHA-256: dfcf7992841442b049b2fa00f933188030838ceef968379622db4158f5b0ca70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The primary attack pattern involves luring users through a malicious attachment to a site that then facilitates further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://thucphamchucnangmy.vn/uploads/files/bateropevanumodubibivi.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b2b7db64f8ace490d55ac8a605062f5/90559015491.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bolazajax.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/53692805020.pdf
    • http://goteneplast.se/files/images/file/18654125558.pdf
    • http://capitolmetrophysicaltherapy.com/files/files/90501695377.pdf
    • http://agierresrl.it/userfiles/files/lemanezobinuravevupevogo.pdf
    • http://color-gateway.com/userfiles/file/25588898865.pdf
    • http://factblogs.com/uploaded_files/userfiles/files/jigefipebe.pdf
    • http://j1medical.com/uploaded/file/10310164404.pdf
    • http://ghibms.com/userfiles/files/95301841675.pdf
    • http://nelly-design.ru/upload/files/gorexekabep.pdf
    • http://pro-roubenky.cz/UserFiles/File/takesupixab.pdf
    • https://vicotelecom.vn/static/source/images/file/duximawolixanimimilutav.pdf
    • http://web5gstore.com/Files/files/mugis.pdf
    • https://bestcoloringpages.com/userfiles/file/61034052662.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/71343163529.pdf
    • https://giltmorestukko.hu/ckfinder/userfiles/files/sadavibawom.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/vevifiriperemikafavabuxu.pdf
    • http://tzoetemondje.be/uploads/files/51861759333.pdf
    • https://riosemarescentrodemergulho.com/ckfinder/files/jubobexe.pdf
    • https://alirezamirmohammadi.com/images/upload/files/44290983982.pdf
    • http://nage-z.com/ckfinder/userfiles/files/78566709973.pdf
    • http://autosklo.sk/pictures/file/tadorifinabowojukoxaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=english+full+movie
    • 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_off00010461.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 16792 bytes
font_01_sfnt_off00011c78.bin
d829736bbc346c44deed44832185165312ef7e4dbac8a0866f3d50793f7670b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 10448 bytes
font_02_sfnt_off000133f3.bin
51d2c008ca0804c26fcc8d8dbbe240269f107bb3aaa36fc1f557d1564925e1df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133F3 17228 bytes

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