Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8712eef1b6ce08…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 07:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e337e9c8400928d306226595f6f00dc6 SHA-1: c76c06b2b25363c850bd6b27c523064af4d9ca9d SHA-256: 8f8712eef1b6ce080a28615546202f72d19bf410ec67993e80aaec5309c43e3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to external domains, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's used to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 http://phuvuongcorp.com/luutru/files/pomozuxef.pdf In PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/zinezajuzud.pdfIn PDF document text
    • http://gapp.fr/medias/files/kapekota.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/diferavakun.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/84743156226.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/dulet.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021911_152945_257.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/kisamoxex.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/99649988171.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/12385149371.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/ligurumavofazipuri.pdfIn PDF document text
    • http://ladna.pl/user_images/file/69219344732.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/kaguxebuve.pdfIn PDF document text
    • http://meditopthailand.com/file/55070977102.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/nuvivoluvifutofa.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/xedobivuxuja.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/1930335930.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613210edc557c---pagujepinuma.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/56361373338.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/37613219539.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/fefawuxisagal.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/vipubetazezu.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/81892052148.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/zalumufutotejapa.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/lulomevir.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/90012760664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=japan+drag+racing+3dPDF 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_off0000cb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 10288 bytes
SHA-256: 019520041ec6135230c6276adba375910293c03569be961b5393c1789db3918c
font_02_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 18440 bytes
SHA-256: dc4a10b584c17f4ebabbbcbbad50c5fa689a48a7e3c12667585ad3b2d7105a9f