Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2a8198af1419ac…

MALICIOUS

PDF

90.3 KB Created: 2021-09-21 16:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfa1be3a26bd9b0753eb65bee33aa249 SHA-1: 3d70017cc603ce8d53288f78cea58a81fdc14dd9 SHA-256: cd2a8198af1419ac62f63b77e4c180ac926f323bb71b5a422cef2249b54d68d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://netart.hu/userfiles/file/37795566836.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386f3cec3a2---96027940768.pdf
    • https://specializedfacilitymgt.com/public_html/userfiles/file/dilolisaxavir.pdf
    • http://thegioimaychaybo.com/app/webroot/uploads/files/zalome.pdf
    • http://terhautz.com/upload_files/files/79594661478.pdf
    • http://donghobaoan.com/uploads/files/69217536188.pdf
    • http://back2wood.de/userfiles/file/kavev.pdf
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/pufimor.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/vavewinesakiri.pdf
    • http://pengyou-english.com/FileData/ckfinder/files/20210921_81D9FA9498BEB8DF.pdf
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/90628049633.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/fusanukemazixiliporogaxu.pdf
    • https://tutorsbureau.net/userfiles/file/16487105693.pdf
    • http://vhshf.de/File/tujuxawige.pdf
    • http://mobitransjogja.com/files/xesipenaf.pdf
    • https://ropaalmayoreo.com/images/userfiles/file/turizigex.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/gamenikupanidig.pdf
    • https://gegeny.hu/uploads/file/55399265989.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144697ce86a3---50484610015.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/fabiwizeluvovepeduvugogow.pdf
    • http://nutrizionisti.eu/public/thread/risorse/file/90256428575.pdf
    • https://www.passion-rnd.com/upfile/files/2021/09/03/katelanivigumoli.pdf
    • http://keralastatetailorsassociation.com/userfiles/file/puwikisegalodavaxukevugo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=update+play+services+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d346.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 16792 bytes
font_01_sfnt_off0000eb5d.bin
5b114a34cc788c70447d2327af9c59d910a3eff7b7e154679922746f278c72ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 10564 bytes
font_02_sfnt_off000103a1.bin
e02f7a2c62afe0e867be0da5a6f2f525b9ab3943161d924a42da68a9fbd817a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 16324 bytes
font_03_sfnt_off00011a02.bin
8b98714870f4cf0801c2291b9775669907d32f2115ed57754d8340b230aace4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 21880 bytes
font_04_sfnt_off0001529d.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1529D 1680 bytes

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