Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6b06cee5f4467d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 09:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a5603fddac0ec6136f0595a429baa29 SHA-1: 943dd4e9edcf1bdb82ac6f936e2a1748bab37bf9 SHA-256: ec6b06cee5f4467de95ad4b1c5d158e5ff4043f321ddb86bab1b4795732b701e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the redirection of users to compromised or malicious websites.

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 https://allytemp.ru/uplcv?utm_term=telechargement+de+film+gratuit+sur+android PDF link annotation
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68995039224.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/66526871590.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/48662922198.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/26373036165.pdfIn PDF document text
    • http://beta-rc.com/upload/files/80499319843.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/7427237583.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/zalolinuwov.pdfIn PDF document text
    • https://peterdegendt.be/file/wojavivodalinudekogosofo.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/2578921128.pdfIn PDF document text
    • https://pr-dienst.ch/file/71781144844.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/82486543740.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/66578716738.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/jenejitibupijuto.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161346a45859b5---xemadudik.pdfIn PDF document text
    • http://showdoimovel.com/files/files/tuxegofarejerixesudefowi.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/bitunasubefabufigowu.pdfIn PDF document text
    • https://digireg.at/upload/57609749083.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210905013729.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/12277027502.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/63147420856.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/jiwelakaxexelawafe.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b567d3aeca---seritupibaxawe.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/63991089517.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/xupiparelalunevujojijuju.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/36556005564.pdfIn PDF document text
    • 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_off0000df20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF20 10984 bytes
SHA-256: d6a676aab9694ffac82288d4acdfa26dce1692c235d799f2223861d2c1eac61b
font_01_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 18632 bytes
SHA-256: 6c480f2585bf96144ddfeb5e4fc939edfce62ef8aea114a39b250e36a840e677
font_02_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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