Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57f8e676f7cc321…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 17:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f9018338ec89574d4a7ecbe1d79e06f SHA-1: c7c0c99952f58ad8ac773eca5e6d891db8506154 SHA-256: d57f8e676f7cc321efe5155f11098867ddd45800e361c9007b032edcc804fbe4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://proximeo.com/ckfinder/userfiles/files/zosab.pdf
    • http://trustarshida.co/cache/fck_files/file/fifikofakexopafepirebebon.pdf
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58474854854.pdf
    • https://iva-vietnam.com/userfiles/file/jotagese.pdf
    • https://bodymason.com/user_uploads/files/12775061114.pdf
    • https://blv.by/upload/editor/files/genofafojufawa.pdf
    • http://cocoal.com/uploads/file/23547591396.pdf
    • https://groupekineconcept.com/userfiles/file/33692318866.pdf
    • https://aecvfcom.nrgence.com/upload/userfiles/files/94415325054.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/pubitu.pdf
    • http://4els.ru/uploads/images/files/kobogi.pdf
    • https://sieuthimaytinhcu.vn/upload/files/99013259706.pdf
    • http://vipacademy.org/userfiles/file/zepukalisarezuzotogudol.pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/lulawekaraminira.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/514693796.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/58207261013.pdf
    • http://www.mostenpo.jp/userfiles/files/ralofurosuxakadiramur.pdf
    • http://drprdesaihospital.com/uploads/wowupaxenamuzapuguzowurof.pdf
    • http://nifaelectronics.com/userfiles/file/jawejonajutinotilevif.pdf
    • http://jsushibrea.com/uploads/files/46871081290.pdf
    • http://synthecinter.com/userfiles/files/56093853463.pdf
    • http://zezoalza.com/ckupload/files/fubigolud.pdf
    • http://secretlove.ch/ckfinder/userfiles/files/18851605064.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+awakening+by+kate+chopin+pdf+download
    • 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_off0000d45f.bin
68f4ec41ad849dce15076c316af86746a817017b0f0271191c38fc15046bbf1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 11028 bytes
font_01_sfnt_off0000ed99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 16792 bytes
font_02_sfnt_off000105ab.bin
012337f4fb972d5414cc08aae51eef178a87d9a78bc2477b80326ae369933a32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 18436 bytes

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