Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7dfea90d4f4b6e…

MALICIOUS

PDF

75.2 KB Created: 2021-06-01 02:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f2fe8ebe251cf365e794c3211e5f79e0 SHA-1: d116634b4c415d2d3f03c8608ad6fc39ca8ea4bb SHA-256: be7dfea90d4f4b6e54c29c148203da3a20da3a0599cf22230609ade7764df55e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/123?utm_term=most+efficient+space+heaters+consumer+reports PDF link annotation
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/guxakipusivo.pdfIn PDF document text
    • https://jexurelo.weebly.com/uploads/1/3/4/8/134853401/wewoxagubax-wevalope-bevitali.pdfIn PDF document text
    • https://farumurul.weebly.com/uploads/1/3/5/3/135326432/1546586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_603a1cf9468b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_6065fd1cbd491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487897/normal_5ff77f93efc09.pdfIn PDF document text
    • https://kapiluruge.weebly.com/uploads/1/3/4/6/134672566/80d2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_601092683cc30.pdfIn PDF document text
    • https://xisasuwida.weebly.com/uploads/1/3/4/4/134472621/565e4d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_60372d4ec6e1e.pdfIn PDF document text
    • https://vamexerop.weebly.com/uploads/1/3/6/0/136085595/pivutusasid.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/8664429.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozixokumo.pbworks.com/f/jifadesebolorilexefawew.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144416592/which_fake_gps_is_best_for_pokemon_go.pdfIn PDF document text
    • http://degenazi.pbworks.com/w/file/fetch/144433602/how_can_you_tell_the_difference_between_rational_and_irrational_numbers.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/w/file/fetch/144434451/57803980130.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144432597/how_to_get_stinking_rich.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144415128/how_to_run_originality_report_in_google_classroom_as_a_teacher.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144420369/vudosav.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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 5228 bytes
SHA-256: c99127ee3bc05b2d3d0e09c7c600c217e9b45091f1d14957f6d65de8d2d22091
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 10960 bytes
SHA-256: fd52ccfe4b2d55461fc2686058a543f300e4482b41c33cf83f331f330953ba03

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