Malicious PDF — malware analysis report

Static analysis result for SHA-256 b816362cd54f7207…

MALICIOUS

PDF

77.5 KB Created: 2021-03-14 21:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 612f85ecc22327e51d9d34577544fd32 SHA-1: d0c042a8239d33eb5e96c1fc65c8a46a92664dc0 SHA-256: b816362cd54f7207a36ceb56b1ab41900d7afcad15cb2b7e1611945251e4ffe9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ponafet.ru/wix?keyword=jogos+online+no+click+jogos+papa%2527s PDF link annotation
    • http://wamuwosola.mygamesonline.org/can_you_get_a_realtor_license_online.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/hi9uei6/12748769900.pdfIn PDF document text
    • http://fuwiduwoxobol.mygamesonline.org/breakfast_at_tiffanys_restaurant_san_francisco.pdfIn PDF document text
    • https://cdn.sqhk.co/kusasuzona/a7hePcu/oxford_business_english_dictionary_online_free.pdfIn PDF document text
    • http://copyrights-notices-helps.com/is_crime_and_punishment_goodgsioj.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/dyson_dc35_manual.pdfIn PDF document text
    • http://jarevine.mywebcommunity.org/thus_spake_zarathustra_name_meaning.pdfIn PDF document text
    • http://forpost-electrica.ru/zajovuzutukalinakobof0syny.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/i8AbC4L/nail_art_designs_for_summer_holidays.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/68079301639.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/BgfNeQE/96266487852.pdfIn PDF document text
    • http://help-service-support.com/wwe_fastlane_2019_results_bleacher_reportmqjj4.pdfIn PDF document text
    • http://nomiwiturej.getenjoyment.net/juvogametedigakelaf.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/itc_company_balance_sheet.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/zitupaxorof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_0c6f0e89ea4246cca0bfc7d7f7e268af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolawatin/addition_worksheets_for_grade_4_maths.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/ap_human_geography_unit_13_vocab.pdfIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_8f8d1f68a38d4185a1797eece04bfc41.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kevava/zavaketevubusig.pdfIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_68f3a984223b47beaa4bb0b17ef5f393.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_ecbf977898ae4efb9ef4693df00f58e9.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_aa34579a28094afdabfaa4f75e1feb36.pdf?index=trueIn PDF document text
    • http://samesesodore.onlinewebshop.net/what_holidays_are_celebrated_in_el_salvador.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/88391154310.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_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 4876 bytes
SHA-256: 4b44aa9d6dc0c7d0a005f6400432d8868249e63219c29ca10943c2b34b8cc254
font_01_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 12172 bytes
SHA-256: 21e3f0c430b754a0157f1580fdfd7bbdec51b0a2d8e2c5852b211234a0c54e26
font_02_sfnt_off00011870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c