Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8331e53026d6d61…

MALICIOUS

PDF

84.5 KB Created: 2021-09-26 10:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f869cbd4c19439c75b31459e11339c13 SHA-1: a757e73b9ad70f4031cd653ea122e6e97120b61a SHA-256: d8331e53026d6d61e15675c1f60c337677c9fe51464c421844e4bfbccb5ada41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious sites. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://massimosusto.eu/userfiles/files/15023159203.pdf
    • http://imhome-listings.com/userfiles/files/41140939227.pdf
    • https://conrays.ru/f/data/deturakifasudiw.pdf
    • http://eaupureinternational.com/userfiles/file/46721899296.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614677145540a---85489517105.pdf
    • http://www.addvanceo.info/userfiles/files/jesufuzitapixofebevejas.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/q4c0j1m754csgjf35eu0520b2s/30674250986.pdf
    • https://curvy.tw/upload/files/65781546964.pdf
    • https://andana.us/files/files/9856602664.pdf
    • https://essuances.com/ckfinder/userfiles/files/xonogifazigogisususipeba.pdf
    • http://railwaysrailroads.com/upload_files/files/89597345110.pdf
    • http://tnetimes.kr/upload/file///88493716911.pdf
    • https://pmsp-me.com/userfiles/files/55146556981.pdf
    • http://izmirtavla.com/upload/file/zozuzunireroj.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/95918575431.pdf
    • https://mimpidia2.com/contents/files/62099228586.pdf
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/jolizejafefiditoloxu.pdf
    • http://technimexvn.com/images/ckeditor/files/251823127.pdf
    • http://abbaorphancare.org/survey/userfiles/files/6149860852.pdf
    • https://centaur.vri.cz/docs/files/25949251375.pdf
    • https://dlt-nkp.com/fileupload/file/84669474002.pdf
    • http://njxinbell.com/upload/files/65939832722.pdf
    • http://euroear.eu/ckfinder/userfiles/files/24119443936.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=aplikasi+kamera+android+terbaik+untuk+fotografer
    • 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_off0000e75b.bin
f5d92ccf3292203c364fae9f545d9afc6f1237303e5252e91243da55206fb94d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 16604 bytes
font_01_sfnt_off00011277.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 16792 bytes
font_02_sfnt_off00012a8e.bin
a3f9619edbdc194c3b4f1a17a692fec14736d8b91555fb610f98c124ac4ab7c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8E 11156 bytes

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