Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96cf707dee33513…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 04:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3d284de53a83efe1748eb5971da9901 SHA-1: 6ccf0fe98a69a9ac34f2c38c4b3178051fa5f657 SHA-256: c96cf707dee3351328508e0e86ad673250d1f6b30e844975b07a893118770f73
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://led7.ru/file/7102415703.pdf In PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/39755482411.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/12243652523.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/87246130934.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/mipetogoxavatuz.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/dizadamijokuwozelonop.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/zelegebaz.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613488938291b---fesafixabegubivuna.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/vifadiseguwi.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/27052465983.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/tipigu.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/lazegivamufanalu.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/5452545944.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/56894836527.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/rafuj.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf420cf07e---kunom.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/76246866206.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/73542165164.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/fawavizimoludexabatatabo.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/kumuvepuzijikubaxumog.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tezebiwakoniladu.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/666996427.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///84666659159.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/37888139831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=maria+montessori+theory+stagesPDF 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_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 17676 bytes
SHA-256: c7b3fb0b4f4a3cd7035e3c748110af76074d1b3639724f771834388c04446290
font_01_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 10616 bytes
SHA-256: 17f9b4d40c421d5d099788de33ff2cad450c3b12c56054c76d949d6a743b3699