Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c11e3742663e7c…

MALICIOUS

PDF

76.4 KB Created: 2021-04-06 00:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9a0b6f455fca8c155231bd02abeded00 SHA-1: 449318e5420637f8f71d4c27857cbeaffeb5e076 SHA-256: 49c11e3742663e7cf246808728f4142c60a1228ceb41e3d54f18029d1d215604
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword search term, reinforcing the lure of providing practice questions to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/award?keyword=primary+6+algebra+practice+questions+pdf PDF link annotation
    • http://moitender.org/all_information_is_true_and_correcti5yj8.pdfIn PDF document text
    • http://trokot-tonirovka.online/762389215772u548.pdfIn PDF document text
    • http://jizerigozigalav.getenjoyment.net/cdisc_sdtm_implementation_guide_3._3.pdfIn PDF document text
    • http://mizarujil.mypressonline.com/27406282986.pdfIn PDF document text
    • http://wumokejo.iblogger.org/66035956031.pdfIn PDF document text
    • http://belplitka.ru/thomas_troward_biobtlcy.pdfIn PDF document text
    • http://dovulup.iblogger.org/free_project_expenses_template_excel.pdfIn PDF document text
    • http://save50.pro/77032577717dtcoa.pdfIn PDF document text
    • http://front-glass.website/codigo_penal_militar_colombiano_20157c2rp.pdfIn PDF document text
    • http://mattelipsticks.site/how_to_turn_off_everstart_jump_starterfxzgw.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/99620742269.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/ntn_needle_roller_bearing_catalogue.pdfIn PDF document text
    • http://biomaniks.website/wiguziwozrfweg.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/anemias_oms.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/650d2460-d7c1-427e-816c-bcbdf23babf4/36138843248.pdfIn PDF document text
    • http://gijuvove.epizy.com/77347625952.pdfIn PDF document text
    • http://wekabubijiwazel.rf.gd/12_months_to_24_months_developmental_milestones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167db68d-dde7-4693-9a08-1207aaf0c3b1/nalas.pdfIn PDF document text
    • http://jilovin.epizy.com/citra_emulator_android_new_version.pdfIn PDF document text
    • http://fodabobaxuti.epizy.com/97251977681.pdfIn PDF document text
    • http://tepoduzurajik.epizy.com/logic_gates_using_diodes_and_transistors.pdfIn PDF document text
    • http://kukosuluwab.rf.gd/past_tense_and_present_perfect_tense_exercises.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_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 6000 bytes
SHA-256: f8caa8b26c34ad0c7b18f01c1a9f168e8ed7e75c732fbc2abc40339997742f44
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 11644 bytes
SHA-256: 855e3a027f576874ac721d4d0e127bc1bdd74734e16c022a376138b66fe6c893

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