Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1ef5057375e22e…

MALICIOUS

PDF

79.0 KB Created: 2021-04-03 01:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e013139bff6f9ca9c53588817a2fbce6 SHA-1: 55cc8a4b4d8a4be3622587e733f1a9f3b3c44e64 SHA-256: af1ef5057375e22e6e6f3e506fddeb60efbbd813ce2e3b84f041aed2f666eb83
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=baby+shower+banner+template+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475375/normal_6013b2948deaf.pdfIn PDF document text
    • http://rubeatyshop.xyz/300029227453hoii.pdfIn PDF document text
    • http://fiwazurenorin.iblogger.org/platform_bed_frame_full_wood.pdfIn PDF document text
    • http://basvuruizleme.online/arjun_reddy_full_movie_tamilmv._ree57gv.pdfIn PDF document text
    • http://my-favshoph.online/13853403670gakwj.pdfIn PDF document text
    • http://discovljzg.fun/silent_hunter_3_keyboard_commandsjmdbq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486758/normal_601c69c84b6d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pegozegi/letter_format_for_job_recommendation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/432a53f0-abc7-4c8a-848f-e519713258f6/lisode.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/jeduwirulajo.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_ef661e5337df4e2695c22c0a9609fe1a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/68692275862.pdfIn PDF document text
    • http://mopobarijokix.rf.gd/balancing_chemical_equations_worksheet_answers_11._2.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_9b38506c7a1146aaa5d2894b2e2daf5a.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_3a2203418e784f07afb7475a188b6d67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de03b63-aa1a-4c23-9543-2d66a8a4a818/kofetajojazunenofadaxa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 5404 bytes
SHA-256: 196e7b0fc3e638071da679833b152e91e024a3835c9e2fb41c886f7ed1d9dfa5
font_01_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 10980 bytes
SHA-256: a435240ddb1d4bc1e60ea58c5a240ecaa44083e1a1c87e3dd32519a16775b900
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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