Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5c780fd44b34b7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 00:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d531994486ccb5d3c48f8118ec4b3ed5 SHA-1: 555579d6edd537333274d0258eb5b6a8c4fde2a1 SHA-256: 5d5c780fd44b34b7aa54fde1bc8c37a7fe950f3c50c73f818368b4fdfc63dab8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The critical ClamAV heuristic identifies this PDF as a phishing trojan. Numerous embedded URLs, including one with a UTM parameter, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a link farm designed to redirect users to potentially malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2990

Heuristics 4

  • 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
  • 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://infrive.ru/uplcv?utm_term=movies+demon+slayer PDF link annotation
    • https://argekaucuk.com/nbg/upload/files/zatoluwak.pdfIn PDF document text
    • http://princeverma.in/uploads/files/86521711283.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/jejetajofoluzonatumapop.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/87892459485.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/xazijexiso.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/rovojuf.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/pusosowufagevorafeji.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/xopabifadamanobivatuxovum.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405f568a2a3---kakadag.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/56269001174.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/petonesisewuluvukegudof.pdfIn PDF document text
    • http://origo.ws/userfiles/file/damubegekiworijileduf.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/nipevugerimalotumiki.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161421941d43e0---18690347874.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/bonamiwawaguxabu.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/14430300571.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/gabivu.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/kazijovef.pdfIn PDF document text
    • http://potlista.com/file/files/74777434182.pdfIn PDF document text
    • http://beiks.info/public/file/99577650547.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/veziguvipegekozuwemejade.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/98165420992.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/tolilirularovibepavorepu.pdfIn 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_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 22232 bytes
SHA-256: acc48c2506a54c9dfeeb24ad4fda2d1210c71574b0b95303421854854fdedc09
font_01_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 10484 bytes
SHA-256: b7e22b12d50376973be9061babbd7bd48cbd3347d1d22eb9c0f75de9fdbe3d1f
font_02_sfnt_off00013803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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