Malicious PDF — malware analysis report

Static analysis result for SHA-256 88161934aeab628a…

MALICIOUS

PDF

104.1 KB Created: 2021-03-20 04:03:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 911f6c1529f5088ee90faeffcde84bf2 SHA-1: fdccf71332629de163d7b60a84dab450eafeb1bc SHA-256: 88161934aeab628a6e0393be8f3e6015792a722d2194ab49cb078d7f935750ed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm for traffic redirection or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/award?keyword=catalogo+mary+kay+maio+2020+pdf PDF link annotation
    • http://becloud.website/fegesatarexuvunova1ce5l.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/nojodosatenabirejazotulilhit43.pdfIn PDF document text
    • https://xogosafaxisomig.weebly.com/uploads/1/3/0/7/130739024/jidigisuse.pdfIn PDF document text
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/tamojopam_menopubureketi.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://s3.amazonaws.com/tabobujimo/ridifujesekilibat.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/xosijugavivapizala.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_8a91033dbc1f412e873b09842fa308f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f52c91b-abfb-407c-af3a-ec0501f05770/data_analytics_for_beginners_amazon_using.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d8a557-7d18-44ae-9e2a-902761202660/palipo.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/42664834208.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_b727401bf3034fe08ebd7d66c98b1cb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/53083510875.pdfIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_533b8aad57914462ad013ce3d014739a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sasufufa/materials_science_and_engineering_r_reports_abbreviation.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/bjt_electronic_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/financial_reporting_meaning_and_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cef121a-d7f8-433e-94bc-bc9466886adc/43701325128.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_015f0122a3194c49840d2e4e46df3aaa.pdf?index=trueIn 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_off000147a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A4 5212 bytes
SHA-256: 58cf8ee5333b8da5b2f326a4baeb21aece085ab7202ceaf73c905298893f12e0
font_01_sfnt_off00015972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15972 14872 bytes
SHA-256: c8bda76003a740878b74c0103cb329b2d0cbe1787a6d7003d199e0fcd3fb5f37
font_02_sfnt_off0001853f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1853F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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