Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5391a339dc61a2…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 06:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13202b9a5f7bd73ef13113ee68aa2b78 SHA-1: a837794eeea047c659b02687df69e059196a1ea4 SHA-256: fd5391a339dc61a2db5be107ce61d56bc8ab05833a79150c27fd2d3c37dc4dd7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of the ClamAV detection 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external URIs indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8725

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://soxebez.ru/award?keyword=shed+plans+pdf+free
    • https://cdn.sqhk.co/saguregifu/ghz0wZq/soccer_mobile_league_16_cheats.pdf
    • https://static.s123-cdn-static.com/uploads/4460048/normal_600014ac6e448.pdf
    • http://testertumentum.space/how_to_start_engineering_careerrqzoj.pdf
    • https://cdn.sqhk.co/vipatemeluti/Zgd7ihF/15454365027.pdf
    • http://formulamoney.top/how_big_is_the_american_navyfvyx7.pdf
    • https://cdn-cms.f-static.net/uploads/4372080/normal_603c74da74bc3.pdf
    • https://cdn.sqhk.co/divojimo/4jaoA7W/91940394978.pdf
    • https://cdn.sqhk.co/gozigawefo/yKgGgjB/big_win_plinko_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_8eac6adb63b64ed2a36faf3595b6f489.pdf?index=true
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_2cc47f986a9e4d2a8cc3f3e24914415e.pdf?index=true
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_e1c1ac21e10a4c62b24bc1707e719ac5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3bde696c-ca66-4752-8f6a-ebec1c3d3802/44250840331.pdf
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_d4b4b3bde2af4d11ad04c195c9b91936.pdf?index=true
    • https://uploads.strikinglycdn.com/files/84d9cf2b-d7f0-4cb4-9d00-8a04a74220f8/rutuzidetuzidex.pdf
    • https://uploads.strikinglycdn.com/files/9a539e1d-ff1e-46f8-8118-26851733047b/nulotekive.pdf
    • https://uploads.strikinglycdn.com/files/065855b8-1bb6-43e1-93dc-f87acd3fb888/1042312537.pdf
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_e4995f71cd164ad491a22ae27a3a9163.pdf?index=true
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_271872b0d94b4ffab8b5cfd9c3e55dd5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8a6f90c7-5398-4a8a-b137-62b903e45169/oculus_architecture_def.pdf
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_c458611f44a14b0eb298cf6eafdb8648.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe8.bin
ba614b2d0978db4935cc9b11598a1da2513baaec98dfc69b2723af53a6f1cb29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 4780 bytes
font_01_sfnt_off0000fc07.bin
5f80f92aae5cacf0128dc687a0b526f6f5a440be9f79055f514d26ab98c6bd9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 11040 bytes
font_02_sfnt_off0001218e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 4324 bytes

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