Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfd4e867c501aa9…

MALICIOUS

PDF

80.5 KB Created: 2021-01-30 18:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 06a64a59c29094575a900ef55c1db945 SHA-1: e79222d6bc3fa9e944954dc34f76f753abefcdcd SHA-256: cbfd4e867c501aa9725b5e970ba3c88aa5063fa3dd9d19d420be647287dba31f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to potentially suspicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites, possibly for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=dbt+pdf+distress+tolerance PDF link annotation
    • http://ig-copyrighthelpcenter.com/zowigusipubokotrrs5.pdfIn PDF document text
    • http://bavunexebiri.iblogger.org/aggiornare_android_huawei_p8_lite.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/djfFcAp/spanish_word_of_the_day_app_android.pdfIn PDF document text
    • http://demask.fun/gajudinipivuzwm0.pdfIn PDF document text
    • http://chebsvet.ru/stocks_us_stock_quotes_penny4h0r7.pdfIn PDF document text
    • http://dsv-trening.ru/e_bike_kit_with_batteryc9dta.pdfIn PDF document text
    • http://ses-paypal.com/skyrim_elder_scroll_dragon_code8cpk7.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/hfgfxid/checkers_pizza_trumann_menu.pdfIn PDF document text
    • http://vsedlyatebya.xyz/xuan_feng_shao_nu_2x20vd.pdfIn PDF document text
    • http://albl.ru/spirit_airlines_check_in_timesut96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dikewovob.epizy.com/82952925312.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/audible_audiobook_format.pdfIn PDF document text
    • http://fufagagebo.epizy.com/aircraft_maintenance_manual_boeing_737.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/51560462020.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/sojojifapenevox.pdfIn PDF document text
    • http://foripoj.epizy.com/air_cooler_project_report.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_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 5288 bytes
SHA-256: e6eedafe04246a579a982cf3e024087925772ba0aad8bbfaf5765b80e4db2de1
font_01_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 10872 bytes
SHA-256: 0bb288dca6eeba4e74845b917461678e8dd4424d9202065d64223aa91f89e678

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