Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62c06a2f9f756d3…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 19:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd41b695c36f145a2c40f303ea93b261 SHA-1: 1dd2740a8518968ab2ac8358a73eb7d5cbd64936 SHA-256: f62c06a2f9f756d374e943709380ffaab3a282da4adfe844e49f12f4efdf0298
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of many distinct, low-reputation URLs suggests an attempt to obscure the true malicious destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://everestlodgelukla.com/userfiles/file/zeloxuvajegaz.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa9219da24---951620385.pdf
    • http://jj-metals.com/userfiles/file/2021090211563473499.pdf
    • https://ap-qatar.com/userfiles/files/21399446429.pdf
    • http://advairtech.eu/assets/userfiles/file/vepalapo.pdf
    • http://guidesdugrandlarge.fr/images/import/file/bitego.pdf
    • http://cermak-expo.cz/data/files/file/petumesidanozufed.pdf
    • https://eletvital.hu/uploads/files/fifamuna.pdf
    • https://kochitaxirental.com/ckfinder/userfiles/files/30323255220.pdf
    • http://thy-environment.com/userfiles/files/15820768540.pdf
    • http://aircond.md/upload_fck/file/fivogosivovevewa.pdf
    • http://aiaato.com/FileData/ckfinder/files/20210924_5CEDF5DBB02744E4.pdf
    • http://agrobud.net/uploaded/file/gajerusidefoxobupomaxad.pdf
    • http://siltherm.com/ckfinder/userfiles/files/jaxeragomosudogofazavu.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/lokovusuwesetisebefes.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/97821639314.pdf
    • http://t-eamplus.de/web/editor/files/gemoxijanebi.pdf
    • http://olympusflights.com/files/files/losuxebevukevupuzukosugu.pdf
    • http://color-gateway.com/userfiles/file/futijirevuputekul.pdf
    • https://tsegypt.com/file/27156011512.pdf
    • http://smcertificationservices.com/userfiles/files/dukutula.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/hovpikac1vjjlgj7k7eq9nj97s/nawugumapemaru.pdf
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/92083333279.pdf
    • http://uktohabbarijamalta.com/files/file/vogutugomowiz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+root+android+device+manually
    • 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_off0000b1bc.bin
393fffefced1330cfaf70f31680dc3b64738a6912505d58902e29d1b797f1940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BC 17184 bytes
font_01_sfnt_off0000dd5f.bin
473ff5ee1fc578f351c0a630ee16719ade2fea9526880e2fd4723fc4b9fb3930		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 10720 bytes
font_02_sfnt_off0000f5fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 16792 bytes

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