Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b7237eda6c69f7…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 10:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c35a78420192bcffbda40475bf60433c SHA-1: 5a4b544284b2fea557d69d49ee84b70c75de8928 SHA-256: b8b7237eda6c69f790ff61083c76a181b83f76528cfa63b37d1c0f9e250bd590
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 0.9990

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://baarspo.ru/strik?utm_term=bulova+marine+watch+band PDF link annotation
    • http://vinnipoh.space/84541143488zs3y7.pdfIn PDF document text
    • https://bomawivipevesuw.weebly.com/uploads/1/3/4/8/134852605/mivelegaf.pdfIn PDF document text
    • http://tesar-krd.ru/my_institute_diary_for_pc9opc2.pdfIn PDF document text
    • https://nusiteraj.weebly.com/uploads/1/3/5/3/135347212/jozimuvajebujeb.pdfIn PDF document text
    • http://podarokinsta.site/carcassonne_inns_and_cathedrals_rulesrac0f.pdfIn PDF document text
    • http://boothattendant.com/96351309109j8ayk.pdfIn PDF document text
    • http://naturfresh.fun/puzakelobikefaz34xad.pdfIn PDF document text
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/natudevixitop_giviputij_bakididar.pdfIn PDF document text
    • http://autocredit.moscow/lobivumiresomopukuhzr0w.pdfIn PDF document text
    • http://titoto.xyz/asp.net_mvc_viewbag_listbyrvw.pdfIn PDF document text
    • http://mebelrostov.ru/social_contract_theory_john_lockeklz8z.pdfIn PDF document text
    • http://theplafond.xyz/complete_english_grammar_books_in_marathi_free_downloadimgei.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/3384b365f42.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/13404140312.pdfIn PDF document text
    • http://firstreadersclub.com/autosys_jil_tutorialqu23w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/sevepipefu.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/sony_sa_w2500_subwoofer_manual.pdfIn PDF document text
    • http://dugerem.atwebpages.com/conditional_asymptotic_notation.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/kewegojotifozafataz.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/42175311687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1524bde-c549-4b84-ba98-be906dc725f0/dr_seuss_collection_20_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e44a998-a320-49c3-9f6d-b68d7d05a7bd/delta_airlines_flight_attendant_salary_2020.pdfIn PDF document text
    • http://nozozuwovore.atwebpages.com/can_you_still_use_rabbit_ears_to_watch_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/what_helps_menstrual_cramps_go_away.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/eset_antivirus_mac.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_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 5344 bytes
SHA-256: e4f5dfc5dc4e55803d275a56992f5e76d0ce8291bb3352e8049bbd814a6ec31d
font_01_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 11104 bytes
SHA-256: 182807accc4f7a8cf027feda1523988a40c63fad053167794c91f6a45e52ef56