Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1ac192cfd28e69…

MALICIOUS

PDF

89.5 KB Created: 2021-03-11 22:47:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3a11d4128bdedd42bbdbae5c36c88117 SHA-1: 4771732ff460acfda1743a4bf4c0808757eff705 SHA-256: 4c1ac192cfd28e69fadcb8161c5e3a76e4ca2f6c641ffc34b3b746255fc0c52c
126 Risk Score

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 0.9946

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://dugedepap.ru/strik?utm_term=mem%25C3%25B3rias+p%25C3%25B3stumas+de+br%25C3%25A1s+cubas+filme+download+dublado PDF link annotation
    • http://pihodze.com/bunker_hill_security_camera_wireless_setup0yszh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_60232bd970673.pdfIn PDF document text
    • http://helper-badges.com/best_disney_piano_book_for_beginnerspnm69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490272/normal_60468c2c688dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402261/normal_600397983fad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455195/normal_603f77865813b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_60163dcec9a6c.pdfIn PDF document text
    • http://aycotoro0.xyz/sir_arthur_conan_doyle_short_storiesr3bp7.pdfIn PDF document text
    • http://igonlinesupport.com/90742791328k3xw7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454426/normal_601974923fc8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_603b376b0e7da.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/tegoxiluxe.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/polytropic_exponent_vs_isentropic_exponent.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5fe7f2b5a624a.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/the_smartest_guy_in_the_room_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488842/normal_60067a4865d9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450638/normal_5fff4e2ed4a05.pdfIn PDF document text
    • http://namelesssouth.xyz/25050415745myr1e.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/wolina/29162504939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b8ba1c-2e3e-4279-b355-e5f66b9747d8/how_much_are_contour_next_one_test_strips.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/zugizopifixijonakewene.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/powerpoint_comparison_chart_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/ssc_stenographer_exam_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0886f80-c508-43d7-8451-a2c961991167/654335285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5fd1a5-58cc-4c0f-81f1-cc3f3acfd0f5/understanding_business_and_personal_law_crossword_puzzle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32774f9f-dba4-45c7-a74a-5307290c9f88/aa_tradition_11_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d577a86-b723-46fd-8506-2c30f2a3d20c/30564357371.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/alberta_capacity_assessment_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 5908 bytes
SHA-256: 233c3bc04f3e5314740ba2cfb8a1c3b12577d37289e5c4ed7e315096752270f0
font_01_sfnt_off0001111f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 13292 bytes
SHA-256: 351ab92c9ddea7c8d824fca3420dfc05f64a88de60b9d7910dc157230491ee63
font_02_sfnt_off0001398d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398D 17828 bytes
SHA-256: 05a95ce66521138d79c5dbc1d6eb5ec5268f608e37b16245c5684c5f701f4e13