Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b6315108d23eb1…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 06:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9cda5881bc3db18304429c563a0dfc6b SHA-1: 265832d7ca7d8e87e4e593196951af4545274068 SHA-256: b6b6315108d23eb198b6aa72c23d49358845a7fdb255e71162d00ed2a6dc805a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.lukoilmarine.com/ckfinder/userfiles/files/77513209416.pdf In PDF document text
    • http://grimastone.ru/files/7066370182.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/91645741579.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/48159625319.pdfIn PDF document text
    • http://szjg.hu/images/file/12385433175.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/96317677889.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/90115360241.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef8f348bc6---wowekesogat.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/ruwefupow.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/tomupenaraxarewuxar.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/85887067334.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/dabokadazedava.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/47894089964.pdfIn PDF document text
    • http://fedime.org/imagenes/rarogixogedag.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/50525733359.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/nudimabeledid.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/60590599247.pdfIn PDF document text
    • http://seamacros.com/upload/file/suvix.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/q04ofng2hvgs0nt8grdoh62lr6/sipezipaxiliroja.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/depusupegubari.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/57161787250.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/68384960588.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/75889110563.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/wisirafuzagaxurapekok.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/tulodokitulibibizej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=insanity+workout+utorrentPDF 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_off0000b632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB632 18652 bytes
SHA-256: bae8357a488421b2385e14b4c6cd39a4c40883ad0b3d30520c852c9ea61c54a0
font_01_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 10396 bytes
SHA-256: 9a56be1e0af52024c6a86ee8c67abcf5cb944dce9cf72058d7dff0c0ef11f51b
font_02_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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