Malicious PDF — malware analysis report

Static analysis result for SHA-256 208edfc7a9595b97…

MALICIOUS

PDF

98.3 KB Created: 2021-10-31 01:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cf69dccbe580dd10c5089ad7b5138a73 SHA-1: c7305948ea677579290b9974d2cf963d59105b3e SHA-256: 208edfc7a9595b97654b970a4859c2573c7b8e076127bd55ea8fcc28cf775fdb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of malicious intent. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the sheer volume of links points to an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dulichtantai.com/files/uploaded/files/48507339468.pdf In PDF document text
    • http://fotografieindex.nl/images/uploads/vuzugaxexoparozudotimen.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/26595987287.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/1908609099.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/tibakamubobu.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/mixewejonurogogo.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/wunibowufawunibofera.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61591D3EDD981.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/rozujutugagejilamoteb.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158277456965---74006484894.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109222008468212.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/78911206364.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/88825233087.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/21725966768.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/33389919786.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/93361584976.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/48839831003.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/vinozavageriforajon.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/nulozinemaxife.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/lojuramodipusedolesol.pdfIn PDF document text
    • http://grimastone.ru/files/tomogivuxewadazuwi.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/33565146427.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=piggy+physical+description+lord+of+the+fliesPDF 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_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 11012 bytes
SHA-256: 587ab8cd638e6f98a8a328e873544be36f1e2e5571fddac597ddf9edfe472815
font_01_sfnt_off00013250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13250 18800 bytes
SHA-256: 60fbfcba52c72ebccdaa931b8fa902a0495b0c1aa4ae2dc689e33189d34b0351
font_02_sfnt_off0001633c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1633C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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