Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6758c5b005e315…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 14:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bcba47b67175b9d7696193374f21402 SHA-1: 40fe3779cfa479c61a59fdee0a810f44e4f758d1 SHA-256: fc6758c5b005e315b6aa9118b75d61a8bcd9e985566fb0c52dbbac084e6cd062
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also indicate maliciousness. The presence of many external URIs suggests an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://alebusph.centralcms.cloud/galeria/files/98538013486.pdf In PDF document text
    • http://rld-carbon.com/file/netijaxixizib.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/fevekinanurum.pdfIn PDF document text
    • https://scalper.ir/data/files/file/tasiwuliwedinezixu.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/46386532891.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/23558945708.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/buroru.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/90278893739.pdfIn PDF document text
    • http://didopack.com/files/4005300513.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6ff0a814---16296701715.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/9033679784.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/79001117368.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109190447475054.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/zasajeripazujidodepixux.pdfIn PDF document text
    • https://cubic.is/userfiles/file/nilebuvofugowibonezuse.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/zepuxepekesipub.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/toxifebowujopu.pdfIn PDF document text
    • https://naves.cz/res/file/nevulas.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/vodikiraweri.pdfIn PDF document text
    • http://word.mn/uploads/assets/janitanekowivebo.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/73369735415.pdfIn PDF document text
    • http://ifap.it/images/file/2145689562.pdfIn PDF document text
    • http://abwrva.com/uploads/files/bukenerikagodijijojapak.pdfIn PDF document text
    • http://classoft.ro/userfiles/file/nojetatitital.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/vetezatawasirub.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/77579398519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=picsay+pro+free+downloadPDF 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_off0000bd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD41 10716 bytes
SHA-256: 05fde5db447cf5c76827fd4948c4266706d91c6b70f46c9eb2c89f42a0d5523f
font_01_sfnt_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 15320 bytes
SHA-256: 10c358138958e7a1e504c5d61d9102f07a56e150285740c35898ca749b744133
font_02_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1