Malicious PDF — malware analysis report

Static analysis result for SHA-256 da786a5e729c3b95…

MALICIOUS

PDF

100.3 KB Created: 2021-09-09 17:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2f5b1a8ae5643667255a08eccc40ca52 SHA-1: e6199aaeb0521113de9fbfec05ad7d53c522d738 SHA-256: da786a5e729c3b9560b5c719a69acab6a560b989f037d78f0d4ebdeda39662b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cssh.es/img/file/6642904932.pdf In PDF document text
    • http://trust-law-firm.com/userfiles/file/20210909180426_1274385804.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/84399255314.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/df3s1pvgq4ib8g13s9s6n93s85/66864146291.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/77134090174.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/11374905251.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/22570260475.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135c08de76c8---wafureletotujodi.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/3904119573.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/wawubuleponiribiditoguw.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/bozirovulupixumudelatunos.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/60297806092.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/bitafavosiwarejivuzexo.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/47444291371.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/mivigu.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/71380186227.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/93482640725.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/pamufegabodovo.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210901140041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=do+i+have+to+play+witcher+1+before+2PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F8 10884 bytes
SHA-256: f504f802b9c36b8d7084593224c8ffc6d5b4bd885dc7d4c89eb20502dcf040f1
font_02_sfnt_off00015233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15233 19132 bytes
SHA-256: 91c37e3f3a37317ac6c4b2bacb7782dd07b67540f3341b1c5a5b39faa6f84bc2

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