Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef26adb7304b27f…

MALICIOUS

PDF

77.0 KB Created: 2021-09-17 14:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c6edb303a4c6a9eb6764e961ffce130 SHA-1: 1e8301b8edf4fdaae12355ab72fa6bd14c4cbe64 SHA-256: 4ef26adb7304b27f18ef709c0259bb2959abfd7bb2805656b4450c9ebb709cd3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the redirection or execution of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=50+free+likes+trial PDF link annotation
    • http://ge-mak.com/files/nuvewisif.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/kalemanid.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/kugugimoku.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/disewujerine.pdfIn PDF document text
    • http://pasted-radio.de/web/files/52896051104.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/36530571028.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ccf2193bc---3302477554.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/75255379210.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/bifefunigodezida.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/47609795991.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/jilewulobovoduvon.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/jaboridivo.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/66164394034.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/lokeborupufawalopam.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/witog.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/verasipatopofanazeketa.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/tewunikomedase.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/67736260179.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210903_B233447EA22C4863.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/bepewugijabunevezow.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e8e1942b3d57dec11d2f298890901dc1/tusutoginegatoli.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/teramabopotofed.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/93629250656.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/palesexodebanurepuj.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_off0000ccea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 10232 bytes
SHA-256: 8a288536b39178bb64c2e6240d2a6a66055f7ed5d88fa9d82d4683de7102720a
font_01_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 16672 bytes
SHA-256: e99b812c9cc86541688f9ba57ed91653e4c6d7721d86ca0eb9cb3c1d5364072e
font_02_sfnt_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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