Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fa45a6d2f659d6…

MALICIOUS

PDF

68.3 KB Created: 2021-09-16 15:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 278d41e2baa289d02e944ea873fe3157 SHA-1: f3d44d64765bcfc4a42978a7b5a5869855c5ac0c SHA-256: f3fa45a6d2f659d6eb5e0c8ded9e75dc1a00637bc1263bc4e7ccc6a23390d816
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=apk+free+fire+download+for+android PDF link annotation
    • https://eownauto.com/uploadpic/files/94614857285.pdfIn PDF document text
    • https://ambalatender.com/upload/files/liworigiratevotifofigum.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/98064906350.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/74761751112.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/wakogobujixazil.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/53526481817.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210912_132735.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/83948333716.pdfIn PDF document text
    • https://airxps.com/userfiles/files/jezabipexezukixagebu.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/14254230207.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/98163803175.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/gadatamolenoradul.pdfIn PDF document text
    • https://jobtiara.com/files/files/parodiledupafapigekifesa.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/kemawozod.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/jikonudajotulerer.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/55718207570.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/13018470334.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/tevavujevasadaruvejijipav.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/45644550484.pdfIn PDF document text
    • http://etkenkalip.com/files/11321725351.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/97208339727.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/74094784482.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/dec4f77699b26c4ad001c30e841d2431/wulezenemepobuvilan.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/xikenegepapavozoreganux.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_off0000aedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDB 10384 bytes
SHA-256: 7d9b2ebd9a71bdf72044dcad6f60edf5055f7ced281df82c460f8411aa2f901f
font_01_sfnt_off0000c679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC679 14736 bytes
SHA-256: b38d202a726319301e0f898897cb83adf5691edaafb0ce568387d6e7936d2e16
font_02_sfnt_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1