Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2687924c484900…

MALICIOUS

PDF

68.0 KB Created: 2021-10-03 10:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 599bece531b1108f1a65340161d35f38 SHA-1: 1a0213fdf07d59acef1a9cd9820f195eca790b6c SHA-256: ce2687924c4849000d420601485f7d77bc26468c1e538593ff397dabfe41df1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as http://aromaonly1.com/yamituki-n/uploads/files/43052842702.pdf, likely lead to phishing content or further malware downloads. No scripts were extracted, but the PDF structure itself is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://aromaonly1.com/yamituki-n/uploads/files/43052842702.pdf In PDF document text
    • https://semangkamerah.com/contents/files/27079473325.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/41638611609.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/bopek.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/jekoxokapusemalex.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/jilazilikukewipivofu.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/bibawopulik.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/69645083395.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/josugotigupibanedenekefes.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/14124458604.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/m14cfkad05d8b2q08j2pdtfda5/rowemukozatokasubexatu.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/38210937687.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/62375768196.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/79996977583.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/89516259184.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/60261484376.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210926020945.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/95711344207.pdfIn PDF document text
    • https://alutat.com/data/file/dixeli.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/mipaxugizudomuvobur.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/botetinexomuxazotima.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/xatapadepumazili.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613003d86c098---laboderof.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090508034043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+science+book+pdfPDF 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
stream_003_off0000d324.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD324 10504 bytes
SHA-256: 5520db77bc3f441bc0df1ef9c114f4f8714ef0c825b24099f3012da887e3d62f
font_00_sfnt_off0000aec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC0 14436 bytes
SHA-256: 18a5047ad214c8d59e5c989a2f62c5f26d0f55dd2017b467f94805ecca6fe8e3
font_02_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1