Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90e45325904c716…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 11:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a0a7c6e3941adb60e77963c7613bdeaf SHA-1: e3834e3d3416414291cd36de4e6cfe4a7e3e8543 SHA-256: c90e45325904c716b6b65dfc7b9766b4b82448c34c32ba056b00b0b33abb9045
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://chiangmaicharmingtravel.com/ckfinder/userfiles/files/fawebidigavinawenunonona.pdf In PDF document text
    • http://zamel2.pl/userfiles/file/dodevuvamelejuwokagupas.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/423657255.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161440e8813785---95762523657.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/9733087824.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/56597043590.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/xebabuke.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/59619455321.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/gufadedanoz.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/ketufuwovafiwige.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fesuv.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/60059888538.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/17326125316.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/taramufudes.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/29634690021.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/69630790858.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/lurepirefijiz.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/kubofeburegux.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9294b26db7ce34535a8f7f8e9648574d/nijekofagajezuwefov.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/54590131933.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/91433985627.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/33969085797.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/wuwaz.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/60965354001.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/51797892644.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210831234847.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/wanajiwuvuvuda.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/60069478602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+app+stores+in+chinaPDF 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_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 10544 bytes
SHA-256: 991d6e7d7146f70c860c81539a7f36755da35a44783b285a9887d1d605524d85
font_01_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 17280 bytes
SHA-256: cfe4dbc99167f21026f9ef0f63eff6b395f8cf24d1117932436df70b0905603d