Malicious PDF — malware analysis report

Static analysis result for SHA-256 27753961a454586c…

MALICIOUS

PDF

82.9 KB Created: 2021-10-17 13:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6d7af770c8d530625aa34fbdfc97126d SHA-1: 3cc412d4592a90f31f2a2e4e240fc446b1f4e5d0 SHA-256: 27753961a454586ce7d3b1afa2fcfe0e700c5cf5d5cf1a7e9388cff9225d658c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts, reinforcing the idea of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kimwendelldesign.com/ckfinder/userfiles/files/kenominiwawe.pdf In PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/91801467007.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/22048892284.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/rafibidirerogifoxa.pdfIn PDF document text
    • http://consade.com/userfiles/file/wozirutetefutaba.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/82553895806.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/55628565199.pdfIn PDF document text
    • https://parc-hotel.info/file/86759326048.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616a3e515d0d4---nujamujamonezelekilori.pdfIn PDF document text
    • https://salonrewards.ca/images/file/jejovogavifozodafatimivis.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/98689612124.pdfIn PDF document text
    • http://imi.vc/upload/files/93597487772.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/13600128495.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/25151939761.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7393daa2a2d13eda771d36af64eda0c2/4864284686.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/rakobudetaxolekukusagof.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210909051734.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/nifuxaxidulizigivuwad.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/30179572605.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/6613543462.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/kitevuvu.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/45577145089.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/fokam.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/keloxebedir.pdfIn PDF document text
    • http://sparkpro.lv/content/file/popisalegibaguvowojoko.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=3+letter+words+from+aPDF 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
font_00_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 10480 bytes
SHA-256: 25bfb092ea73ab9709396f58d1fcf4fddb934766b526904f2478e9f89a07b5b5
font_02_sfnt_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 18300 bytes
SHA-256: 298bdb3bf83c2c3cff9cf48ed2a76bb2a530b7f9d2dfce51fa40bc786e3b6bba

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