Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6aa549d6840d80…

MALICIOUS

PDF

80.7 KB Created: 2021-03-19 10:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1597b6098930d0e3f6e3d38786a6f600 SHA-1: 5574fe576234df7937adf61d0dc6cd91ff98fa56 SHA-256: bc6aa549d6840d8058826d199f9f3cd9d775b59eb2f88f2b11973d9f9957e819
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as part of a link farm designed to generate SEO traffic. One prominent URL, 'https://nipisod.ru/award?keyword=centrifugal+compressor+components+pdf', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://nipisod.ru/award?keyword=centrifugal+compressor+components+pdf PDF link annotation
    • http://lulopoboxefon.scienceontheweb.net/how_to_put_a_bobbin_in_a_sewing_machine_singer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/bifubosaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69c8706-edc5-45b8-9cd4-f29be24cb698/48166706929.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/ip_camera_finder_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a97a0d-267d-48d6-b763-79c15ad64173/sony_str_1050_app.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/ampere_apk_old_version.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_6fb04a8e67d841acad5c673f4ffc8757.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/gotetexabaselu.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/what_causes_a_dryer_to_not_heat_up.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/13940899970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce47276-7770-4a97-a569-328d60d89300/noxajuz.pdfIn PDF document text
    • http://bopewexe.onlinewebshop.net/isometric_to_orthographic_drawing_exercises.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/linukixobinarotikolulazid.pdfIn PDF document text
    • https://9e28b13d-ef5c-4d18-821e-e071a8932918.filesusr.com/ugd/0b0738_b1ba41f073a84f138cfd179dc4b71212.pdf?index=trueIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_e0bde6b93b0348f1b055f628c0d344fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/42669502985.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/calendario_2020_feriados_chile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1268a0c5-6163-4274-916d-8cccf896ae6c/los_cinco_lenguajes_del_amor_test_para_esposos.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/15296229555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c4fb039-cf12-41cd-aa45-ebb2b1ab51ed/dinufegidovipezipa.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_76625ce0a6d04dc28b25a7d820f713ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/68946349827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4cedf9-b39d-4fa4-b476-ed94d392ce30/89994118299.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_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 5380 bytes
SHA-256: 92ff4c83aa33975afa47b8d7805daf4bf8199f91d234c32ef910f654152250e7
font_01_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 10740 bytes
SHA-256: e524a7cd32f156b601d60e56d1fe8b0859624204cb0f627277f4709e01cf2fe4

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