Malicious PDF — malware analysis report

Static analysis result for SHA-256 d915b717548c3128…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 14:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59c1f2dc99cedd1fbe6543b301286377 SHA-1: bf99c97df3e92a0983b36337374e76206a2f9b82 SHA-256: d915b717548c312813535fa7f11952852124aad4da19b2ac9fb60008273925d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates these URLs are likely part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the URLs and the phishing detection strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=organic+chemistry+mechanisms+pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/70685678528.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/1838168915.pdf
    • https://trexanh.net/upload/files/56639755795.pdf
    • https://careerroots.net/ckfinder/userfiles/files/61941879308.pdf
    • http://cocoal.com/uploads/file/menugunolugizevowutaxo.pdf
    • http://unipsyclinic.com/userfiles/file/20210905143506.pdf
    • http://testplanet.nl/uploads/files/44484117010.pdf
    • https://superpart.com/files/80298779962.pdf
    • https://lapakunited.com/contents/files/38344741385.pdf
    • http://sinorarechem.com/upload/files/61247471687.pdf
    • http://abnicum.ru/files/file/48340785866.pdf
    • https://drivetripper.com/userfiles2020/files/6481918564.pdf
    • https://yukkumpulgroup2.com/contents/files/66903903723.pdf
    • https://demetraproject.eu/ckfinder/userfiles/files/mevapizanig.pdf
    • https://epiphanych.com/images/file/80116724490.pdf
    • http://nessium.net/userfiles/file/21873636968.pdf
    • http://potentialdesign.cn/userfiles/file/1630699969.pdf
    • http://ornito-silesia.eu/userfiles/file/70641169285.pdf
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ralasukadupizeze.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/nabufojevesegikeluwadaju.pdf
    • https://apotekatia.ba/fajlovi/junenaturoromapizugifu.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/rewobapuga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE11 16792 bytes
font_01_sfnt_off0000d623.bin
eee4a1c051b9cccb3ceafcbb556119fc2457d54e6ce449b5ebc95bf5bed3f0a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 17960 bytes
font_02_sfnt_off000104c1.bin
5ca3a0d46cb1d44f82bd3b16a5b3558d3d9b99a1b1e467c02c97971bc30c8a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 11040 bytes

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