Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1f16acde62ea4d…

MALICIOUS

PDF

73.8 KB Created: 2021-03-11 22:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c8dd19ac3808e403a8fb73b2e404d9cb SHA-1: 3fa9f852601ecfae440ad4f9203b8edea5239782 SHA-256: cb1f16acde62ea4da58524b4f7c4b4ceec8e93a92aebabb48899091c55058dfb
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 identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/award?keyword=quine+mathematical+logic+pdf PDF link annotation
    • http://bullbananavannaone.xyz/verbos_de_regimen_preposicional_listaedl3r.pdfIn PDF document text
    • https://kabolonopatine.weebly.com/uploads/1/3/4/2/134265344/fokafiwe.pdfIn PDF document text
    • https://wutusubefesuw.weebly.com/uploads/1/3/5/9/135961291/kotorugogorub-kepedenofumirer.pdfIn PDF document text
    • http://totalcreditcheck.info/opentx_companion_2.0_download5jw10.pdfIn PDF document text
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/b977e.pdfIn PDF document text
    • http://creditpm.com/play-_code_promo_codes_for_playstore_and_appstoremg1uz.pdfIn PDF document text
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/rujawa-mijoda-wesan.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/rowusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa41c215-32d4-467e-bb4c-a6dda515ff5a/bhagavad_gita_telugu_online_reading.pdfIn PDF document text
    • http://mogejizezapeb.epizy.com/38632360279.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/palekudanuzujitetimoribiv.pdfIn PDF document text
    • http://kegotetebam.epizy.com/express_publishing_upstream_b2_workbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aed4bff-6441-4d80-9e7e-f0f65c9457b3/26203395674.pdfIn PDF document text
    • http://kifugelewepin.epizy.com/vefusufawipimesedaloge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6381b83-f91b-4bc4-8485-f0fd63fcc750/jawbone_speaker_not_working.pdfIn PDF document text
    • http://vezoxonu.epizy.com/informe_deudores_alimentarios_morosos_cordoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b0a5e4-4676-4246-a0ac-02175c303aee/mozofodutakuxeniradar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a8bed3-364b-48f8-b1ed-7d6e7279ea54/nolakulawogonugujijum.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/graphic_designer_portfolio_layout.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/tibosodirugodepawo.pdfIn PDF document text
    • http://xevarefuwiku.epizy.com/agreement_cancel_format.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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 4048 bytes
SHA-256: dabeb705831c59ef47ace9bb6f064bc34833c37ef3c7de28b910791745172d48
font_01_sfnt_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 5356 bytes
SHA-256: 683dfd69b5b870e93e04b4a5170f8c5570ffe88e8f5c45691fff71bca30aa39b
font_02_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 10436 bytes
SHA-256: de1cbee5e7fd8532cdf71616f4db62196870b501deb8e29d78f8968eec5a3e0a