Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf7f0849c1048a2…

MALICIOUS

PDF

84.9 KB Created: 2021-09-23 12:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1d6b7f11616f2877d49eb420fce1626 SHA-1: a0a39bc84e5b858db8560b03a209a857fda62b4b SHA-256: cbf7f0849c1048a29f355e54a989a7e749a424393fbb33a285baf74b33840ffc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, with a high probability of it being a phishing or malware distribution attempt. The presence of embedded URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ketchas.ru/uplcv?utm_term=cinema+hd+2+apk PDF link annotation
    • http://thepnguyentran.com/media/ftp/file/wuzorirafopupinugubimax.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/kasuzinunidip.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466f4e165e6---zamipiwosiramalusosu.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/39344525246.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/pofadudaloguwufebifufa.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/48897199618.pdfIn PDF document text
    • http://vln.nl/files/file/4029502975.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/58114374619.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210920_60AB7B0AD5D2D047.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/16774962873.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/tamejetajapebalosa.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/65711010774.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/juvujitawerajowif.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/46835195034.pdfIn PDF document text
    • https://slide-bearing.com/d/files/42726959274.pdfIn PDF document text
    • https://network-italia.com/file/zuzapezuwejogugimakokof.pdfIn PDF document text
    • http://sartor.ru/upload/files/ravanejilomazavojunov.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/kusizubewofekaxidijutup.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/51471004319.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/60754918207.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/mofezexivegofusi.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/70387987214.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/7862775628.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/kigubisigeder.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/ranedez.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/vipumotedadafobonobutoz.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/79902164533.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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 10368 bytes
SHA-256: e1be04de5b11af9047166386c5996316fce06b98e3f5d138bd3e7c536c373a60
font_02_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 18240 bytes
SHA-256: c91163bf0e1d0e6de837e8013d6d2cc5b605eb7ccb0285d43551c53ca2671444