Malicious PDF — malware analysis report

Static analysis result for SHA-256 5569b830caa79561…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 07:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8ff25351b1a03e880f99580d1dfc5ed6 SHA-1: 575ada1665c64d7b70e015a35bd37be8e5979775 SHA-256: 5569b830caa795619d29228622ce3c426c1d6bbdcccdd0cba7d01e458cf3fdb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a high heuristic score for being a link farm on disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious sites, masquerading as a streaming APK download. No scripts were extracted, but the PDF's nature points towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/tegumusasikaki.pdf In PDF document text
    • https://cukimentescukraszda.hu/files/files/pusopuzufevuriwe.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/72128561134.pdfIn PDF document text
    • https://frisch.ro/files/file/38144215778.pdfIn PDF document text
    • http://samtekelektrik.com/files/84863608931.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/wonilirofukujula.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/nunozarejabojotiw.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/buwitanojetawabuvobixula.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/bokozasezojedup.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/52236387805.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613eefc9e2a18---57239634690.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/30650246417.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/lekufojiwa.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/forunekemon.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/ruzagovopufuzufelanaxis.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/63397016218.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b3441679e6ff4b550d7cb2af595884b2/2436559809.pdfIn PDF document text
    • http://nature-revive.org/files/file/xofuxatufeporivezo.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/sakumoruxulul.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/fakakibitiboxilulobul.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/jaxobiwukonulejo.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/gekogolapenekuf.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/wusaluboxiwexiz.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/xumifine.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/tomaniwebelegizovemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=streaming+apk+androidPDF 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_off0000b309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB309 18036 bytes
SHA-256: 7e081d3ed0b8746e89892961a87e5e8b19cc5dcf54bbfd023f4fea66d53968be
font_01_sfnt_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 10688 bytes
SHA-256: 417122172c6091136c154cdd317937d1e8a00999e4d3baf9cd66e054f87f50a0
font_02_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1