Malicious PDF — malware analysis report

Static analysis result for SHA-256 87708bcc91087c93…

MALICIOUS

PDF

87.9 KB Created: 2021-06-08 18:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 631548f626a67a42e29fcb64fca09562 SHA-1: c9f0cf25046a2e57d2e22099b8fbf05b815bed7f SHA-256: 87708bcc91087c93b73f01e7e29f4a66b9a0f4e6eba700ffec4e658f8b8a859d
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host multiple links, with a specific external URI pointing to 'https://medvor.ru/pbw?utm_term=pokemon+x+and+y+rom+pc'. This URL, combined with the link farm characteristic, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://medvor.ru/pbw?utm_term=pokemon+x+and+y+rom+pc PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4374522/normal_60b4db3995b79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_5fe8e87cc8132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_6057be98b2bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478422/normal_603282cf9ac2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424011/normal_5ffe54a686074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_600e2142bd3ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374177/normal_5fdeff9fd85c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_606b1ffbeaa2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_5fdbdfc72fcf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420470/normal_60442533c8d9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a369c3e1-b61a-4217-93be-dd7a0b6ff04b/tamamub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4762834a-d80c-4526-9283-6bfc44a6d574/what_is_the_plot_of_the_iliad.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/vujuveteresojixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c65b48-82c5-482e-801f-f2fd40c434a0/bukiwalobet.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144519456/clinical_microbiology_made_ridiculously_simple_6th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2518d42-966f-448e-a56b-36416cec2272/predictions_of_2021_covid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c5622d-6dc3-4a7a-a365-a4f7b8f10435/tamiya_king_blackfoot_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a56cf026-7bbc-4926-b15e-a4d14b15834a/64653280186.pdfIn PDF document text
    • http://gutopevif.pbworks.com/f/naweguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe275553-3034-49e5-8a39-6447f9aa8c91/jedativoliwop.pdfIn PDF document text
    • http://tefimemovem.pbworks.com/f/54014395918.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/f/1120013428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3826e21d-f420-47c3-b152-5b814bdae022/79671799101.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 5244 bytes
SHA-256: b78b09c4fe67e7f19e2f0180ae7e19bd2898aed25bb6059df3e02da99200d51c
font_01_sfnt_off00012b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B29 12168 bytes
SHA-256: baf6148e4a7d2f339150490542edf84a4944f9ff8fd919cd4ae833e050b3cbac

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