Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53114f1f13d7900…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 05:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae0619b12ba9831bdc509f522f699e88 SHA-1: bcd395d6e0bd106aeef19485efba84def1818e46 SHA-256: a53114f1f13d790055a5f8ca8676b8453dd2ad2db6d031a12b2f1d4206fed6cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://only-svet.ru/upload/files/90037805235.pdf In PDF document text
    • http://maxidmum.com/images/upload/fck/file/dogidelepapezab.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/tazinabixagupawa.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/sotuzilikanobekawopavo.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/vipok.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/suvugimi.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/31990752055.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/givunazadeferiwub.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/120271ceabeb9c5ed938257b3d2a479d/dajuvunuvuba.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109082001533179.pdfIn PDF document text
    • http://360global.ca/userfiles/file/21126687593.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/zonepodatotosemu.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/95774147646.pdfIn PDF document text
    • http://status.cz/UserFiles/File/lisetezalixizitivogigi.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/95009662253.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/jomoxiba.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161333fe414d17---26377330651.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/mudokugeropi.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/mezivenuxepexuxaxukofo.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/19002196871.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210902144544.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/noxulovunofirukupesi.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/15592647471.pdfIn PDF document text
    • http://cycling-software.com/files/file/nilabedumovipusefejakavar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fifty+shades+of+freed+full+movie+in+englishPDF 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_off0000b5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F9 16724 bytes
SHA-256: 1c036c079aeaa88ac1e37ae1bb8092cd5991e5fa71343fb98984d0772dfd6577
font_01_sfnt_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 11060 bytes
SHA-256: ecb465154dbfa237c4380d7bcf2413f4b5432c93d7d5e5b874286321cd0f2bc8

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