Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb914541cf8e5069…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 10:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8cecfc5f843c46c33c8e1815c519657 SHA-1: d83f54a9eefd637d62361b0785ae03b9fdd98886 SHA-256: bb914541cf8e5069eb15937da0e7b04066e59f86a38007feaa9546eaeba11627
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The primary purpose appears to be directing users to a collection of other PDF files hosted on potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://thucancakoihikari.com/luutru/files/39380023977.pdf In PDF document text
    • http://studioarclab.eu/userfiles/files/kewumivejitem.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/8228397087.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c82444a0---64242411058.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/tanowa.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/86877996840.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021911056182761.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/xabikuzajuxuwatu.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gidinuxagiru.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/gojexiwiveti.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/60145739412.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/91362220253.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/36300650788.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/53323834506.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/14305607313.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/26658612516.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/49482827342.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/wirasufa.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/46301954455.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141833571ae7---xuril.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/87965663635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=roadrunner+android+appPDF 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_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 17368 bytes
SHA-256: 7e8cbf12e06c25bf4f90b69d8ae6fd1dceaea52d22c5280ab26752ea283fec3b
font_01_sfnt_off00011863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307A 10220 bytes
SHA-256: 477bb6b434370bd032b597c1cb88a1a62eea06708310004a2c53c5be7d7baa4c

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