Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbf1ea23ad214bb…

MALICIOUS

PDF

80.5 KB Created: 2021-03-24 11:03:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9510f17540e3e53f5a070bf5336b257b SHA-1: 7017c6a68657547ab4ae62404ebbcf9b7da5e844 SHA-256: ffbf1ea23ad214bb79ca529d36a6f94ab3cbec44ebe779350a6aeaa3d913e97d
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 0.9995

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://zajinet.ru/strik?utm_term=p3+kill+a+watt+p4400+vs+p4460 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375700/normal_604a780c54654.pdfIn PDF document text
    • http://good-production9.site/rhythm_exercises_guitar18fr0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_603173ee1cc98.pdfIn PDF document text
    • http://lnstagramverifycentre.com/216190225071gbh8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_601bd12e6049c.pdfIn PDF document text
    • http://productwood.ru/strategic_management_competitiveness_and_globalization_13th_edition_citationgvis3.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/ihvpjaR/my_pillow_sheets_promo_code.pdfIn PDF document text
    • https://cdn.sqhk.co/vonixilavot/psjihc9/banner_saga_2.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/8ifA2kn/tolili.pdfIn PDF document text
    • https://cdn.sqhk.co/wamamuli/flFM6rE/79343208646.pdfIn PDF document text
    • http://petersikdar.com/what_are_the_8_elements_of_a_story42r7s.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/oZyx3qh/arizona_cardinals_reporter_twitter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_60276a3df1a9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417318/normal_5fef0104baaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b7f33fd-5d93-4a8e-8b76-7c57e01acd29/42846658908.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/skyrim_ps4_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51963cf-d12d-4ea4-85ac-ce3fd7d176c6/how_do_i_connect_to_my_verizon_jetpack_4g_lte.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/loveraresunirejuxugux.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/nubalubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0839030d-0c6b-4106-873b-163aba4fc0ea/21023096698.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/mechanism_of_action_of_barbiturates.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/nowejogoso.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_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 3896 bytes
SHA-256: 36738228f4c4903fa550ef0ff68b769bbc2324b230ae86ff1481ab62de1304a1
font_01_sfnt_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 5480 bytes
SHA-256: 53a91d3b34ba2c986e97213958c1a28debdfa10fb9a574fd4bef225de8f20973
font_02_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 12712 bytes
SHA-256: f7d30920892ae44d2fc8fa650faadced87a641e2c08113d5df4fad2d7fdc7d24

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