Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4be7ee928aa8a0…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 00:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acc6dbeeb7e83c414511bf4d17afed64 SHA-1: 66f61b9585333ba6b23aed8e0d63b4efcc713247 SHA-256: ca4be7ee928aa8a0086dde4d1b6a684b30aeffae45ce8d34f43bd15a7c14b29b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://dongtienlamnghiep.com/upload/file/regalam.pdf In PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/tevuloninupokenado.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/muvuxanugikapuzami.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/7759594757.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/5603712391.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/64844272366.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/32148439548.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/44328077098.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/51119456524.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/26433338265.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa3d7180d---92986004398.pdfIn PDF document text
    • http://protezas.lt/i/File/zunasizefafasasetodo.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/84447960126.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/20973070257.pdfIn PDF document text
    • http://inica.org/files/file///8005185490.pdfIn PDF document text
    • https://kimcert.net/E/file/40456829051.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d7f01a3b---54608196662.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/domojalidizofaporuvetel.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/xexagowupuwipejonobosu.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/witebaxikawatalarepek.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/vezetotitivurori.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/79539474411.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/segadepagolanipak.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/65214360447.pdfIn PDF document text
    • http://itena.si/uporabnik/file/66120952111.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/22937827576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fishing+joy+2+mod+apkPDF 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_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 17696 bytes
SHA-256: 86202da2aa32b967cd28e5f15bcafd869f7597314a0f24b8fe1856f4db24467b
font_01_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 10896 bytes
SHA-256: c43cd4d24ac1a354cf5ba4ffe5f800b3b44ffbed6cdc230f6decbcff349f9c02