Malicious PDF — malware analysis report

Static analysis result for SHA-256 b204e37d9aff6ab3…

MALICIOUS

PDF

78.5 KB Created: 2021-03-30 16:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7ec3e346789e316969a25ad46810e343 SHA-1: c15ade09daad8db5366f6a0f7d40e7198f1557da SHA-256: b204e37d9aff6ab36c0a31ee34b575bcd2625023e5f71b5f8be63ec8f1b9765f
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 hosted on disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://ponafet.ru/award?keyword=written+after+swimming+from+sestos+to+abydos+pdf PDF link annotation
    • https://kigodebilak.weebly.com/uploads/1/3/5/2/135297846/minuzarexijemes.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/1682497.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5fc7fc9e8ecca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459185/normal_601ad79c92984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_6012dab78c787.pdfIn PDF document text
    • http://laitlabs.pro/zonakekedebukodibotntm9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_6026ab21d539c.pdfIn PDF document text
    • http://batmbatm.ru/siwoxebapibupexanala8lnjb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500674/normal_603711c903c61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404503/normal_5fc67a8cc4ffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_6018da837f426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5fdb8d13546c7.pdfIn PDF document text
    • http://suwufexez.sportsontheweb.net/arduino_8x8_led_matrix_max7219_code.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488842/normal_600679c5a8b32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_601391d378aef.pdfIn PDF document text
    • http://gk-kuban.ru/76460306218xj295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365635/normal_60092c7ac7366.pdfIn PDF document text
    • http://immorta-cross1.club/16589919147ue700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_606301349617a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_605f313bab986.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutugidod.onlinewebshop.net/pantangi_o_pambalana_worksheet.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://scripts.sil.org/OFLIn 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_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 5676 bytes
SHA-256: 7ac61a2c2c091311a6b6a2d484270c5cd149365e4e9086597fd5347ee8913c33
font_01_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 10460 bytes
SHA-256: 850bfd770c94999e5e7e71923fa7d18e3a82ea4016c11493c703b90e272e15df
font_02_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940