Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9048ba6514f4766…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 20:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 56ea80c847bc439ac8e702adad46e70f SHA-1: f2d604a19c109f699193681cb942534fed4383cb SHA-256: b9048ba6514f476654c1a0618029f04fcbd5bb7086a51e2eb1a4d2acacf306bb
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 disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the sample as a link farm on disposable hosting, reinforcing the phishing or malicious redirection hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://oniceh.ru/uplcv?utm_term=how+to+check+who+visited+my+profile+in+instagram PDF link annotation
    • http://wsp.pl/userfiles/file/lipokofa.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/5485214981.pdfIn PDF document text
    • http://evola.it/userfiles/files/83846230190.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/89932415454.pdfIn PDF document text
    • http://plise.org/userfiles/file/16460323246.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/kaxanufeniwisukafetuxoliw.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/xigagamawafubumeroneb.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/wutajolinuwakijalumera.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/zebafomavutojiranovevek.pdfIn PDF document text
    • http://sissonne.hu/editor_up/75410614086.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/bilufozuko.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/88554064831.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630764812.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/vosoxolirilavorix.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/78396950604.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/fenelerexutokowojexamo.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/bisiravebon.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/70996579996.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/2707949860.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/67890791329.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k1449eg47cqucd73ism116vfp0/dasetibosavisigaze.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_off0000d881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 17204 bytes
SHA-256: 316672ef7948f02bb2be8fa459dff044a2d96f3f4bb591c9646c60de9273fd33
font_01_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 11416 bytes
SHA-256: 9485d25b03a742f1829637fcc32535f734ee79127c43e789ab83b5651a527c41
font_02_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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