Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d933ac0295413e…

MALICIOUS

PDF

67.6 KB Created: 2021-09-28 19:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9544bb4d95e2accc46dbf86a6e98bd2 SHA-1: ce7ab461abb3ac5f9d94d6c91c4cf9d51becb1e1 SHA-256: 28d933ac0295413ef0116d0bc72e23143326d6a34beb88644040900c0a6d3072
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=font+name+style+copy+paste PDF link annotation
    • https://interangkorcondominium.com/userfiles/file/50006444134.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/61757264444.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/4787660553.pdfIn PDF document text
    • https://scalper.ir/data/files/file/xikesobavugawalopetoxiku.pdfIn PDF document text
    • https://shibbirs.com/media/files/58778400989.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210921_115108.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161324f45ab04e---gaxaf.pdfIn PDF document text
    • http://www.moyekolodin.com/files/remetekuwe.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/5881424765.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907182223529431.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/xotusakezixizafufokegipe.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/lasefid.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/88494147406.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/11839583776.pdfIn PDF document text
    • http://elpijisystem.com/file/66510195633.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210925_674360B54E2268F1.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/67972937443.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/62915419977.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428c48bc397---gigaxomesewofojosu.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/38131124551.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_off0000ad47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD47 10436 bytes
SHA-256: 00b33f4e7a0015da9d8e33bd6c7d509f40a45e7a58a3d1e3d5a87388f97895b6
font_01_sfnt_off0000c506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 14308 bytes
SHA-256: dec537bc1487e579f42f1f6adfd06e6123254430bec76757b14a9c471ec4d92f
font_02_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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