Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2ba902988a4c6e…

MALICIOUS

PDF

81.0 KB Created: 2021-10-10 18:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e6646811ab1e53e768a314c617bd822 SHA-1: 25386237c805c43dfebcbeff36994bf6eb70b5d7 SHA-256: cd2ba902988a4c6eb08e69adce08d4932b6ce6635b2f8e7f04e90fb5265f673e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was delivered as an attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=to+bear+responsibility
    • http://teusz.pl/UserFiles/file/59404229954.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7a308318c446c92f760a90795ff20b9c/mafewozujapolilevukif.pdf
    • http://thy-environment.com/userfiles/files/13228990801.pdf
    • https://quangcaowebsite.xemlaco.com/uploads/files/33282886359.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/53872543688.pdf
    • https://cabsfromheathrow.com/userfiles/file/79214044760.pdf
    • https://svetplus.com/userfiles/files/71705785563.pdf
    • http://chayka-svg.ru/files/nupadazurepo.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/90699244475.pdf
    • http://worldtile.net/jangheung/userfiles/file/felapediporodinisigikoras.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/dadexawapegasiletijometul.pdf
    • http://dulwichtaxi.com/survey/userfiles/files/sanulavawamuxu.pdf
    • http://saothienemb.com/uploads/images/files/94091843693.pdf
    • https://soudurelauziere.ca/upload/editor/file/54664657871.pdf
    • https://sporyolu.com/resimler/files/lefarijuburagakepe.pdf
    • http://clearspace-design.com/CKEdit/upload/files/nopozadofugerevafefodu.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/cac33a70bdf36b403d4ca1616c5ce9ce/75147292785.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/guxikapamivaludiwowatosi.pdf
    • https://triosms.com/userfiles/file/minememoxemaxoz.pdf
    • http://telecycling.info/files/file/14429454001.pdf
    • http://snft.ro/media/file/muzideduwiwi.pdf
    • 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_off0000d4a5.bin
07b2f6ba91ef3b20f566000b09780dcb6188fb61fd4246b7574903476695cd4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 19620 bytes
font_01_sfnt_off000106e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 16792 bytes
font_02_sfnt_off00011efd.bin
e7e748369cfd559c37e4e3b5dc6957bca8d8dd059816f3440e3af18fc0261abd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 10460 bytes

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