Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fac5357ef473d2f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 14:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5daac34b5fcfdfcd24df9d9a113c809 SHA-1: 3f0876b52cc0fdb5597ed87eca71a7fd7cf51820 SHA-256: 6fac5357ef473d2fa597b7b03904d5d6874cedc6f75ed947f216b3020e6b0c5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or redirects users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of hosting numerous links on disposable domains. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=streamz+tv+apk PDF link annotation
    • http://thementalhealthadvocates.org/files/userfiles/file/donezopapufatogawoluweba.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/50561628516.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312af16a454---77490503854.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6b09544c---95548756314.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/20202102884.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/pogagalifesutup.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/kanaro.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/66055771578.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/62986318030.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/30256648855.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/51717331326.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/jigekipo.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/murubugarinawekubaxifuv.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/kezoviv.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/lusesebuxamosov.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/zamozizuzowojisivutifaf.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///53616355695.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/93923928934.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/16378127353.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/fojatabegezikedukomiwosi.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/fuperimugojijur.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/famoromikepitexaxemavuge.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_off0000b16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16D 18440 bytes
SHA-256: 5f2dacbac4cbe240089a78e431fca9a007a85bb08d0129e13f1fa18be354616e
font_01_sfnt_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 10176 bytes
SHA-256: db275687b62434b0b2cecd4bdc97d50125d690dd7f2b8ea9233a00f5e7686979

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