Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42de28c0f8027fc…

MALICIOUS

PDF

80.7 KB Created: 2021-06-06 14:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a2a64b0016d092c977f1550a02bbb1a7 SHA-1: 84a8c74b3ca804b734262704ffc119f10fb9cb01 SHA-256: e42de28c0f8027fc0f850dfa28c8cb2b231e24006bd4136d94306e582e120e47
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 0.9996

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://archism.ru/pbw?utm_term=introductory+statistics+prem+s+mann+9th+edition+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467043/normal_600440f39f11c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_60655e0c3e114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_60530c1fe951f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refarumiba.pbworks.com/f/zombie_hunter_king_hack_unlimited_money.pdfIn PDF document text
    • http://biwonuv.pbworks.com/f/lingo_license_key_15.0.pdfIn PDF document text
    • http://nafidob.pbworks.com/w/file/fetch/144620670/how_to_join_cadet_college.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144421131/dragon_ball_z_budokai_tenkaichi_3_ps2_vs_wii.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/w/file/fetch/144615138/aa_ab_laut_chalen_movie_song_download_mymp3song.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144458556/wisorumakazul.pdfIn PDF document text
    • http://kuxuraroj.pbworks.com/w/file/fetch/144677850/solucionario_fsica_y_qumica_3_eso_sm_savia_scribd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90f3a8e-91c9-4895-9d47-e576e6ee9aae/excel_vba_copy_specific_rows_to_another_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcbdc6f7-68f6-4231-bd14-b11b2a983bd6/9001_iso_2015.pdfIn PDF document text
    • http://namikikis.pbworks.com/f/buzeputozigisewigiromu.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/w/file/fetch/144536964/what_grills_are_comparable_to_weber.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/rapport_de_stage_reception_dhotel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea49b6b-c6a5-45b5-98ca-34d147c2a385/the_jesus_prayer_catholic.pdfIn PDF document text
    • http://refarumiba.pbworks.com/w/file/fetch/144599442/what_are_non_default_eyes_sims_4.pdfIn PDF document text
    • http://tejudafo.pbworks.com/w/file/fetch/144633420/voserawepole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd518ab-d046-47e2-b643-701fa1e17f7b/mumaxima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6cef375-8bad-4674-8a6b-6d73fc9e4ab7/factorytalk_view_se_specification.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/98531782425.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_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 5680 bytes
SHA-256: ac696d876503b0b0d9298b272f0dcf8da46a5691f6aba1d613279924677afd61
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 11356 bytes
SHA-256: 836bfd0bf055bd3b5513554e1e5e775b7756dd0f4622da73a2e656d0235bdd0a
font_02_sfnt_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 16084 bytes
SHA-256: 6049f7be1eb58524b2bfe5e0ab34f4300347f26dbb23ab6ad605e3b0d5647553