Malicious PDF — malware analysis report

Static analysis result for SHA-256 43aa656c4b5429d9…

MALICIOUS

PDF

110.4 KB Created: 2021-03-08 02:56:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d00a875394262c46705cc498601219f1 SHA-1: e52e4492fcc7a3786277b78cfc86579d12ad5aab SHA-256: 43aa656c4b5429d9d9d1861282077c2bc624e556983fadb03d513e81f6557610
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, including one that appears to be a phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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://maypoin.ru/wix?keyword=locomotor+skills+examples PDF link annotation
    • https://cdn.sqhk.co/dabozijide/fhihbgi/any_call_apk_old_version.pdfIn PDF document text
    • https://cdn.sqhk.co/gibebomesani/cgjhh1h/nifatizo.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/ividjgY/rollercoaster_rush_game_online.pdfIn PDF document text
    • http://kopolebukerone.iblogger.org/ramebemudorovo.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/vjjhhjg/43014140700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_601b96ef8d5b5.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/SIggjiU/jexavizobaxuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_5fd94b4337b4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405206/normal_60092342a7c46.pdfIn PDF document text
    • http://minuzin.22web.org/deluviwimezexez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_d0c915489d1440a1986f754c7bf77676.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_7380c00a35124b858ae0eedba4164c0a.pdf?index=trueIn PDF document text
    • http://katezoluvezile.epizy.com/23463640506.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_b535d4aa156c4b76975602cf6e04c081.pdf?index=trueIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_38c55dda6cba4fce83de73945fb994aa.pdf?index=trueIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_d3d7b1035e06483cbd287af65e9aefe0.pdf?index=trueIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_2db4d2721fc44ba9867861600e917a74.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_c04f8f3112844eb28b0a1329df72ecbe.pdf?index=trueIn PDF document text
    • http://nuxumejaxumem.epizy.com/panasonic_plasma_tv_remote_control.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_9dacedb39ae74961ae4ec2ad44b6068b.pdf?index=trueIn PDF document text
    • http://gateguka.epizy.com/risk_matrix_project_management_template.pdfIn PDF document text
    • http://riperuzitino.rf.gd/clock_in_clock_out_spreadsheet.pdfIn PDF document text
    • http://rotikibijexofu.epizy.com/xowisesubiwaxafun.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_b9ee7c5592c049e4a6795a8e44d1aad3.pdf?index=trueIn 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_off00017605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17605 5152 bytes
SHA-256: e40562903b6312a4a5b0d0f70da9ef39d2456d308f1891dc36bdd05eccb8a7bc
font_01_sfnt_off0001877a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1877A 10732 bytes
SHA-256: 6d300dac0cc08439dfa6348cd1fa830b2ac9f7a958eac3d1e24f75a6bc620e95

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