Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64b5e5f343b917b…

MALICIOUS

PDF

77.9 KB Created: 2021-02-22 18:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6aa1a8e883404fcc49232b0a88c66b94 SHA-1: 9f82438b107cf3361796607e3a81eb124115a6f3 SHA-256: d64b5e5f343b917b2888919862d6d24240d9b3bfb27886fd27a119f411ece775
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 pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, designed to trick users into visiting potentially harmful websites.

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://druttle.ru/123?utm_term=ejercicios+resueltos+de+l%25C3%25ADmites+trigonom%25C3%25A9tricos+nivel+universitario+pdf PDF link annotation
    • http://myluckybet.xyz/8090373782346qeb.pdfIn PDF document text
    • http://leaninrzpd.site/hp_laserjet_p4015n_driver_windows_8.1_64_bit92t00.pdfIn PDF document text
    • http://catsism.com/mamugij5rba.pdfIn PDF document text
    • http://choosemadam.site/fekozubededif79y43.pdfIn PDF document text
    • http://naturwows.space/oxidation_number_of_hg_in_k2hgi4syrau.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/Ijiihid/45627274410.pdfIn PDF document text
    • http://tezatigobupuvu.22web.org/fofawefiremodelobiji.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/RhhngeV/kozabegofozol.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/eNf1XeE/wujurafevuzonakuzoj.pdfIn PDF document text
    • http://torarofuzavu.22web.org/xuvas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_5fd341548c222.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/libyeTx/peruvuvexode.pdfIn PDF document text
    • https://cdn.sqhk.co/rifibimilo/jgYRgdf/33051145194.pdfIn PDF document text
    • http://miwodenexiz.iblogger.org/mexico_y_el_neoliberalismo.pdfIn PDF document text
    • http://latuha.com/semujitibinefolivetonofuwylq5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_5fe3f019c7a48.pdfIn PDF document text
    • https://cdn.sqhk.co/xilasexiki/ghajfiX/knock_down_texture_knife.pdfIn PDF document text
    • http://begetus11ppz.xyz/9157315786755b0z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://difiwawi.epizy.com/4666979017.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9D 5764 bytes
SHA-256: 0270a4f557a509d4650de23e20eb02df7001fc7d26e129893c7312f28bf52ab6
font_01_sfnt_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 1912 bytes
SHA-256: 3839e53850a2e79b4e73274b19c70b7e721a2fe2e791625129d4534e3fe5d5c1
font_02_sfnt_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 12108 bytes
SHA-256: d1407987187f0e55dc2310610f0b6694f00491a13f8cd8aef2650fc09e55a787
font_03_sfnt_off00010f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F31 16652 bytes
SHA-256: 3ab714276cb0e2f975c07c4c644f3cca6b26e66210b67ba5527cc9e19fba3730

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