Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de38ff7335158b2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-24 02:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2aa4551553fea09016868a9fbc6cbaa SHA-1: 3b0e659c2bb3695b13fea9f9016175850ae411e2 SHA-256: 6de38ff7335158b2b8bbbe57fd49ef429951d4a4faac654b14f6f88f23d5f11a
166 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 used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct users to disable security software, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://drafthe.ru/uplcv?utm_term=binding+of+isaac+download+android PDF link annotation
    • https://rubfila.in/files/file/47860166716.pdfIn PDF document text
    • https://samudra99.com/contents/files/84360431896.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/17687977011.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/26908313321.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/19703781976.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/50365688540.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/gafewuvas.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/dabozikekogevofeluzonovex.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/pojowudimadeta.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/54597234159.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/nimuvetemideposozoxo.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/43310314008.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/vowijijotesozotirej.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/71438720996.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/60423088820.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/63765652693.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/66954176403.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/gedimewepinu.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/besimazebi.pdfIn PDF document text
    • http://strandkrabbe-hohenfelde.de/sites/default/files/files/90348633594.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614071895e5c3---jevidowit.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/rezewus.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/vebawefipunijomasafarewof.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/jomokisuvu.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/25270219565.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/74387293968.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/19957263017.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_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 18500 bytes
SHA-256: a054e6600dc4d55c6501521e10d1a949aea13d82bfd7ae1a2c8547b27fd1c936
font_01_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF8 10560 bytes
SHA-256: 7d4b3a2017739b93b62a986b28df14f58cef96ec3819c79d874c9ff3bfbdecc1