Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc58ef47c5baee7…

MALICIOUS

PDF

114.3 KB Created: 2021-04-13 10:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6c97cae3a16f96f783f1f733616746fe SHA-1: 7daa5d569274beb03ba83e613a035f5a0a9bc9d6 SHA-256: 6bc58ef47c5baee7938a1401703d6c9f58a2b16656397b413f368df1574046c4
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, embedding numerous URLs that redirect to various PDF files, likely to obscure the ultimate malicious destination. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=texas+instruments+ti-30x+iis+batterie+wechseln PDF link annotation
    • https://sawisede.weebly.com/uploads/1/3/2/6/132681865/ruzivon.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/iWkgdjj/27574325221.pdfIn PDF document text
    • https://wodumipanopova.weebly.com/uploads/1/3/4/7/134731655/dikumopotot.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/Mhgja2Q/sang_sang_bholanath_video_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/Ihf35HE/bearded_barber_in_the_barbershop_themes.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/reading_comprehension_for_intermediate_students_with_answers.pdfIn PDF document text
    • https://nobopejulalajib.weebly.com/uploads/1/3/4/6/134621416/xokojuwijivo.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/jvGggju/stick_war_2_hacked_version.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pedonasupag.rf.gd/varozimupegirodevola.pdfIn PDF document text
    • http://zerowegujij.onlinewebshop.net/the_positive_attitude_development_workbook.pdfIn PDF document text
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_abace9eb61234190aad21ae1a9f54797.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cb9470-6a34-4d79-9af0-dbbca2afa6d2/que_es_liderazgo_situacional.pdfIn PDF document text
    • http://vipiwimepi.epizy.com/22715118432.pdfIn PDF document text
    • http://jelovinusasanop.epizy.com/behringer_xenyx_802_mixer.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_883f73103c4f4800992e80f196dcdf1f.pdf?index=trueIn PDF document text
    • http://ligexaxo.epizy.com/google_form_check_spreadsheet.pdfIn PDF document text
    • http://retelowanudugut.epizy.com/31250936080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7356cae1-6895-4088-9e2c-0b949233e564/46909538779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fdf737d-c748-474f-81d6-59df08579b7f/norton_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02eff404-a655-4f5b-9efd-ae8f49036cd4/kizadanoxopezaxid.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_off0001814a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1814A 5624 bytes
SHA-256: 4fe0c740a1a15c40c06b1f0e11dbac0606288ae2ff792656b044a2e94c1dd3ed
font_01_sfnt_off00019459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19459 11556 bytes
SHA-256: b5fb7239a20fd75f083c7fee03d69428372d38764c71f39c6eea115ba6faf701

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