Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ce42be015e9210…

MALICIOUS

PDF

142.5 KB Created: 2021-03-28 11:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fa1625def32b491d095c66ac4bdf13f2 SHA-1: 5482dfa6fad4bbf30d3d8d38bdc34ef3d6d37903 SHA-256: 16ce42be015e9210b59dcff8df1eb5ebffced8312eb789841b1129062009d88d
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 0.9987

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://fokemale.ru/award?keyword=ctenophora+characteristics+pdf PDF link annotation
    • http://pitushok.fun/sowegopejaguxemepemefijbz0a.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/what_is_phrase_structure_in_syntax.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/segizazijen.pdfIn PDF document text
    • http://verifybadgesbusiness.com/child_by_tiger_analysisscucd.pdfIn PDF document text
    • http://natur-bio.space/apc_backup_ups_550_replacement_batteryufe4l.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/wesaruse.pdfIn PDF document text
    • http://9gusevshop.space/section_13._1_fluid_pressure_worksheettjwu9.pdfIn PDF document text
    • http://dadevizevarek.scienceontheweb.net/wavituzagi.pdfIn PDF document text
    • http://tibetterrier.ru/the_rules_of_attraction_watch_onlinek9hhh.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/tekezufejegiridojo.pdfIn PDF document text
    • http://zupibupiju.iblogger.org/95575825553.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/sketchup_2013_free_download_32_bit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lisuwar.rf.gd/clash_of_clans_updated_mod_apk.pdfIn PDF document text
    • http://taroxul.epizy.com/material_ui_template_react.pdfIn PDF document text
    • http://pezefaxovojole.atwebpages.com/xotejovudoru.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/jimejogidegatuxoza.pdfIn PDF document text
    • http://koravas.rf.gd/jimewoz.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/vodacom_bursary_online_application_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/3229814367.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/esp8266_serial_wifi_module_datasheet.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/87888049554.pdfIn PDF document text
    • http://kupugajuruta.epizy.com/centrifugal_pump_construction.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/making_charcoal_briquettes.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_off0001e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E285 5116 bytes
SHA-256: ef98956f7c42d6b6831c59f68ebbe37a9b47f8502e5ccf153669f59d0f84e336
font_01_sfnt_off0001f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3D8 1716 bytes
SHA-256: 7775e8e7c4329a1c5bd112c001158d8940360085fc48f9208aadc231de0e3d90
font_02_sfnt_off0001fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC7F 15140 bytes
SHA-256: 5f3ffe881498ee17a73e0de32b9b1b0809064cdd4c8166cdc8280d50a18974ab