Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7baf2af237c664…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 15:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4308c355c4d0b8725aef54161f773e7 SHA-1: 7e06dc39dcb5caf83ec59ed5b2b4d5819b21da73 SHA-256: 7d7baf2af237c664b2a07e3aa0fb2c4378cf10e268adae643ec668b088f286af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this PDF is part of a campaign to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://thesnowmanicecream.com/ckfinder/userfiles/files/nibujebagexamom.pdf In PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/sifesawobibenuveta.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/funefaretiveguwuzivulewi.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109151947237611.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/2142437834.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/podusugefofixomatopufi.pdfIn PDF document text
    • http://pileki.com/imgup/file/xitokefate.pdfIn PDF document text
    • https://agermag.ro/mm/file/sumategafefogixelupaxat.pdfIn PDF document text
    • http://sissonne.hu/editor_up/93472985094.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/17502758302.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/37653526675.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/sonosaminitani.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/zotozelilaguvuvi.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/36086793630.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/86085459404.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/rejafaxakenasowubur.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/rugegovavuzen.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/wunijebuvoge.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/62212584660.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/56116423351.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021916_195314_730.pdfIn PDF document text
    • http://annabarons.com/files/files/71315108980.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4cf9bdff---jobepezega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=vlc+media+player+for+android+tv+boxPDF 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_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 17236 bytes
SHA-256: f9458e920ad89c50dce98c5042a17837c9d37faaad606ff12649895fa9960ef6
font_01_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 11004 bytes
SHA-256: fe3111195c89ac139b7136d979e542655d477219ce4be6511ec6c4d3f996f72f