Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ba034287933f3f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 15:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e93fedc437bd6f6d40de0be2532422d9 SHA-1: b4068624201a338dfc7350015cf16d809521aaf2 SHA-256: f4ba034287933f3f94ad6f52cc66097d07997eca3b813e8bd322b0b9cebabe44
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are identified as part of a link farm on disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to obtain a password for an archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=turn+off+cookies+android PDF link annotation
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/zabuxilegetu.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/vawedavugokugisele.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/53373428009.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210916132939.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210906095718.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/xezawuvedemut.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/66011843606.pdfIn PDF document text
    • http://muszempilla.com/files/file/44666980447.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141226c6956d---golebivot.pdfIn PDF document text
    • https://toocapen.com/files/zizowevidogepoxidum.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/jofabalaxutozafodefa.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/sokiluxavuzukux.pdfIn PDF document text
    • http://change4best.ru/upload/file/suboseregawaromuru.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109052245231745.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/88973864168.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/rumaweboxakadojazifimoro.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/69088926573.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/widuj.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/fubibi.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/9972410965.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_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 17764 bytes
SHA-256: 49edff9a27b5c92915288c2d477acda47c317c95a600ea257d85edde3a3f2cb4
font_01_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 10480 bytes
SHA-256: e75b6f2e5c62e3fb5c1c864dbc4620ea32883852cc553d73c2cbe12c535ebeab

Open this report in the interactive analyzer, or submit your own file for analysis.