Malicious PDF — malware analysis report

Static analysis result for SHA-256 c842d145f5b676c7…

MALICIOUS

PDF

73.8 KB Created: 2021-09-09 00:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5604f0efa850b85cb4a4d1f177ab15d SHA-1: a964f4a0b3124be85a9d71970a22f36404509298 SHA-256: c842d145f5b676c7714fbf089e09baee76a4b8b194d44f382f3975bcf13f058c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns suggest a common tactic of redirecting users to malicious sites.

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 https://megashina24.ru/files/files/dobonadakuluxuwefemovi.pdf In PDF document text
    • http://finproekt-msk.ru/userfiles/file/xivigadivinerusagifa.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/49055735231.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/gumolemuf.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/jirunegosu.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/13301088344.pdfIn PDF document text
    • http://budropol.de/Upload/file/lusivinobenotonad.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/68535419389.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/73084504900.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/60167617278.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/74732310375.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/vojajofetesivagomagawipu.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/74264252679.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/13733055287.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/31172210304.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/43862067341.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/12467687296.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/kovojopuzutovinogodi.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/66611303595.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/53296965620.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/kakodupemubaruzona.pdfIn PDF document text
    • https://digireg.dk/upload/dukupusebibefamurejej.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/74716312878.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613253a58869a---nurejivuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=outlook+account+sign+upPDF 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_off0000be06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE06 10532 bytes
SHA-256: 8cc121bbd216d6f288f130abb714719671ae9e929ea8d7325efabc9c507838f3
font_01_sfnt_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 17068 bytes
SHA-256: 2c505a42479b3ff5b81889d12cdf209749fc3342ffbb3be260b361b88f5e341e
font_02_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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