Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f22c4e4ae80caf…

MALICIOUS

PDF

80.5 KB Created: 2021-10-11 21:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fe23ac4aadcec32688443489c3f6998e SHA-1: 8da640bd30205751d0b73aac9dd9cbd9d488a86f SHA-256: f3f22c4e4ae80caf1263bd0058a02d1b6a3100da68922c1da2b4ef367d8ff41a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://tea-ra.com/user_data/upload/save_image/files/risaniloden.pdf In PDF document text
    • http://odontotecnicacoop.it/userfiles/file/33903751403.pdfIn PDF document text
    • http://davcpundri.com/css/file/tuxasefemuvoxise.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/mexisopodegugigo.pdfIn PDF document text
    • http://razvoj.e-podjetnik.com/ckfinder/userfiles/files/vaxirasovenatasuga.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/17512702461.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/mibovewaluromovederibu.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/46985184427.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/7016050833.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fidoworiviwaj.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/patidapalebirewejotulud.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/27089679027.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/repumumusasip.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/29015533360.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/53554100386.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/50796012553.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/bejawupanaxifarafiz.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202110070518512297.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/29984621860.pdfIn PDF document text
    • https://verner.lt/images/files/79652748415.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/wapewafoguxopafofukito.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/75708321539.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/dawedotesuli.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/reparomefi.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/5309274798.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/fesuvavas.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=pony+colouring+pagesPDF 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_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 18952 bytes
SHA-256: 3307ab5206cb85bc81cf9549ffc8f6783c446faf9b01116d61889d9116fed44b
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 10668 bytes
SHA-256: 4a4d2c093738f974baf56ffb62b73f0079481fd810e7d9a814f833e64240fe0e