Malicious PDF — malware analysis report

Static analysis result for SHA-256 3735961b9e97fc1a…

MALICIOUS

PDF

81.6 KB Created: 2021-10-05 14:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: abd10c8a5ca76ff482928f7117cf5741 SHA-1: fe001f49275060f17ed0157afdb8de2406f4abf1 SHA-256: 3735961b9e97fc1ab7c5d3718abb8821dcfc3e4c9c1237542dc3854106106fe2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests this PDF is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://bodzlomu.com/userfiles/file/26939569292.pdf In PDF document text
    • https://nucamsa.es/userfiles/files/35315220011.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/letukovufut.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/tisamapuwuvolenidavu.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/54828599566.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/81593332257.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/mogujanaba.pdfIn PDF document text
    • https://turbooto.vn/upload/files/50374884348.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/folozipewizegib.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/zagef.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/rowoteton.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/16315272611.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/nupumemizemewetosebuwur.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/7789498305.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/27989575832.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/lawekomafij.pdfIn PDF document text
    • http://mfahk.com/upload/files/24909524174.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/13405298151.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/vuwizufadesapatamigizif.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/5735777638.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161539b9dad39f---gudiz.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/95825605226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lines+and+angles+class+7+worksheetPDF 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_off0000d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 10832 bytes
SHA-256: d094ff3b0b86e9a19c4705255ce4c3f9eafd19fd52cb4d7615cf13cb43830e1c
font_02_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 20680 bytes
SHA-256: 8c6d0c3de57006f1abc24e15bd0a348c90d378914617bff4fd08a2c3914cdbc0

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