Malicious PDF — malware analysis report

Static analysis result for SHA-256 3675978920498604…

MALICIOUS

PDF

75.7 KB Created: 2021-01-25 13:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 36ec80c72f59ff4b1ca859ee82972d09 SHA-1: 102783ce0374f47f8b5d6a4503fb5d4bd3bfc52b SHA-256: 36759789204986040f580151e064e1f242691ef2cc5e0ff583de2beb458731a6
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable hosting. While no scripts were explicitly extracted, the PDF structure itself may contain malicious JavaScript, as suggested by the T1059.007 technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/wb?keyword=lesson%20plan%20ideas%20for%20kindergarten PDF link annotation
    • https://cdn.sqhk.co/puvubuzu/gtAgihj/31138852115.pdfIn PDF document text
    • http://rivimebowov.22web.org/math_worksheets_grade_2_multiplication.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495550/normal_5ff2678715eaf.pdfIn PDF document text
    • http://simkosa.website/popefetakimatuluvote6im6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_5fd18cd8089d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5fda5fcc4acd7.pdfIn PDF document text
    • http://dezlice.ru/color_island_kitchen_cabinets_greenwunfm.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/HEgdoI3/67536193067.pdfIn PDF document text
    • https://cdn.sqhk.co/gasajolop/hijeV6v/horizon_credit_union_sandpoint_phone_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ff97afda3549.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_6005a9fc1a55e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503533/normal_5fedac1c8407b.pdfIn PDF document text
    • http://silvanozito.online/rujekn70wr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415291/normal_60045ab659fd2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gaditerigasut.rf.gd/rarolabuzuzipajesu.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/bangla_full_movie_kolkata.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/seismic_data_processing_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/lines_of_symmetry_in_3d_shapes_worksheets.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 5000 bytes
SHA-256: 54220053c4182f7d31b274a486276fc4fc4d598dcb6b34caaa1dc4c96e144d06
font_01_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 10132 bytes
SHA-256: 0f3ab43ddbdcd18d7550f037aafc38fdda843fa221413b4c08c5ccbf2e37faeb
font_02_sfnt_off00011313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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