Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6830ecb422c24d0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 06:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d0c070139be09c078841ce6097207d8 SHA-1: 6ab358f256881e95f838be4765e3848fb2052a07 SHA-256: a6830ecb422c24d09966ceda7b7f7b568842b67d7431b137af5051651ea4a9af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it acts as a lure to download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm designed for obfuscation and distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://tamphuhiep.com/Images_upload/files/62767465341.pdf
    • http://balbu.eu/uploads/news/file/lebiwevu.pdf
    • https://raljob.com/userfiles/file/pixakedesane.pdf
    • http://csc0451.com/userfiles/file/20210905191033_uz24i0.pdf
    • http://metallpress.info/files/1989859280.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac705912cf---64824905637.pdf
    • https://usgcambodia.com/userfiles/file/tofirewobuxelu.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132f0b31458e---beliz.pdf
    • http://cnsgawefgl.netsociality.com/upload/files/fatur.pdf
    • https://pamukoglu.com/userfiles/file/1210246056.pdf
    • http://novichiha.ru/pic/file/84730914644.pdf
    • https://sitarasign.ir/data/file/juzefigevebawumof.pdf
    • http://ural-resyrs.ru/data/file/87324303129.pdf
    • http://enslev-anlaegsservice.dk/userfiles/file/weponasopibupazujiran.pdf
    • http://project-lovcen.me/userfiles/file/21562380387.pdf
    • http://rts-3.ru/upload/files/kafanijejiza.pdf
    • https://petala.gr/userfiles/file/xovid.pdf
    • http://planet-for-events.de/userfiles/file/zinopexukodefaxo.pdf
    • http://thewellmanteam.com/userfiles/files/xuwoguduxo.pdf
    • http://creativecoms.net/userfiles/file/tijovogeno.pdf
    • http://budoprojekt.eu/obrazy/file/fufunazuwus.pdf
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/xegosinagufewabumonaka.pdf
    • http://preiswerte-unterkunft-papenburg.de/mediapool/28699870804.pdf
    • http://namkhoabacninh.com/images/files/tusoronumipulamekafi.pdf
    • http://umffz21.ru/admin/ckfinder/userfiles/files/fulukupujedojorisasodu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=unscripted+book+pdf+free+download
    • 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_off0000d9ba.bin
45ce066e07fd285f3ea29742d24a322e87f9690d13e43e37d45a57430e9584da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 10936 bytes
font_01_sfnt_off0000f301.bin
c95adef0abb7bf4a11689b4e14834124f48513e34308a1dc004e54b69fea4a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 17692 bytes
font_02_sfnt_off000120bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 16792 bytes

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