Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5e1dbd8ab6745e…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 14:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 59c246151da3e1a1597ea95501411461 SHA-1: 5e344d1958e869fe0a451b29af60de1f8ee608da SHA-256: 9f5e1dbd8ab6745ebec4ff7d0acfb96acd3ed4bc4b4e33f6685e9aae2d1e2e48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to facilitate initial access through social engineering, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=frag+pro+shooter+download PDF link annotation
    • http://engroupe.ca/aym_image/files/51771426714.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/lutesimagedugoguzatejedi.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090303190868.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca5c5e6a35---24391579881.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/fitovixatebidu.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/10245405654.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/99430743262.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/94626067288.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/27681897216.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/wamatavenutoguripi.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/21719992128.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/zipugiribenukip.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/61492633357.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb30a86eec---14784332450.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/20965340040.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/92003458907.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/17171480242.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/vexegulimasu.pdfIn PDF document text
    • http://charontrade.hu/data/file/10902686195.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/gifakopepener.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/fabiloxawonikufaxos.pdfIn PDF document text
    • 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_off0000adcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCF 10644 bytes
SHA-256: ac9ea2c07d1bc4fbc7d971afcac59c9ab027f29dfb55bc7f99771dc8da25b24b
font_01_sfnt_off0000c5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 16276 bytes
SHA-256: b4f91b81022f9a71cfe4d54b532d4cdda593997ebeade89c9020e70340efd04f
font_02_sfnt_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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