Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb12ae470ac3dc9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 15:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e5d424e62de3130b4887405856d1678 SHA-1: d2662ead596c545c363eb87d4bd3894a2536b72e SHA-256: bbb12ae470ac3dc9a5bfedf636f3b7e59859ae7d62c076c86cffbdc25cc514db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or link-farming sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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://ewhamd.net/upFiles/ckeditor/files/74162354262.pdf
    • http://newo.ru/files/files/rojusabogumilawirej.pdf
    • http://contelex.it/userfiles/files/64481049428.pdf
    • http://incomingmakedonia.com/files/files/nawumegoture.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/gamopafo.pdf
    • http://bhttourist.com/upload/fckimagesfile/veziromilize.pdf
    • http://lejuriste.ru/files/file/77530274950.pdf
    • https://bd-sokolovska.eu/userfiles/file/renavobikulifapixekaloki.pdf
    • http://synowka.pl/galeria/file/32515019619.pdf
    • http://chetaomaynganhnhua.com/uploads/files/tepumotodorogozezizipedab.pdf
    • http://cheumst.com/upload/fckeditor/file/90754188244.pdf
    • http://dreamsurgerycn.com/ckupload/files/lopifimulapatefuvasomi.pdf
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/wisilolenif.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/45964737063.pdf
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/vifoporufunumivemikepu.pdf
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/34298404186.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4a3cff25396c4281b4a92a351f181623/tutajozabusi.pdf
    • https://turismo-galicia.es/ckfinder/userfiles/files/divepagutesugozumeletofe.pdf
    • http://sarljarry.com/userfiles/file/40521486079.pdf
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/31998338240.pdf
    • http://khiensa.com/UserFiles/File/63896047405.pdf
    • https://livre-art.com/ckfinder/userfiles/files/bemafujewuwunufiw.pdf
    • http://zezoalza.com/ckupload/files/66158826065.pdf
    • http://mobilenmr.com/files/files/nitejixegabozubosiruxi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bubble+shooter+2018
    • 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_off0000d944.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 16792 bytes
font_01_sfnt_off0000f156.bin
134470e030f301c7743c650fd130cd6d3316ef14bf6780297b605cbec732b729		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 19756 bytes
font_02_sfnt_off000125a7.bin
20999ec4c1a939ee6e2414c112081b5ea792f86d874315c4d423f8a17955f34c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 10644 bytes

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