Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fb3b7bc9579b81…

MALICIOUS

PDF

80.0 KB Created: 2021-03-11 08:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fcc6cc8d69811c0ccadbf419cb89d6ab SHA-1: 9e9c8fe80088077d1f8808564ead2af9a03997b2 SHA-256: 03fb3b7bc9579b81001b993530b9296a3ef796d30d49c33b16b9bec567504a81
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded URLs, with one pointing to 'midufefew.ru', which is flagged as suspicious and likely part of a phishing or malware distribution scheme. The PDF's structure and embedded content suggest it's designed to trick users into visiting this URL, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=different+parts+of+the+brain+and+their+functions+pdf PDF link annotation
    • https://cdn.sqhk.co/tubadaluzafu/5ghsjez/71722329125.pdfIn PDF document text
    • http://medemukiduba.sportsontheweb.net/ethical_literary_criticism_definition.pdfIn PDF document text
    • http://zupedaganivo.66ghz.com/flightradar24_for_android.pdfIn PDF document text
    • https://karelevoziwoda.weebly.com/uploads/1/3/4/7/134718414/2e5ce5e30098a.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/pRfrdjg/bingo_party_decorations_uk.pdfIn PDF document text
    • http://faketikus.22web.org/mg_marg_gangtok_weather_report.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/fakufugosoz-sadimowopag-pezazifomub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://selofedibaxonal.epizy.com/what_is_critical_thinking_in_nursing_example.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/amazing_spider_man_java_apk_game.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/70910037454.pdfIn PDF document text
    • http://surobufalinaxis.epizy.com/55245508005.pdfIn PDF document text
    • http://bodapefazit.rf.gd/geogebra_spreadsheet_graph.pdfIn PDF document text
    • http://virixavop.epizy.com/gopro_hero_4_4k_vs_1080p.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/assignment_first_page_format.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/simplifying_algebraic_expressions_worksheet_answers_math_aids.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/vovase.pdfIn PDF document text
    • http://gulalebiton.epizy.com/raintree_homeowners_association_goldsboro_nc.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 5348 bytes
SHA-256: f8e709eb534c7fd408f8fffa040efc038dec2e1124bec83e32aff6f587de2ad0
font_01_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 10228 bytes
SHA-256: a01d91128498b24071482e2e69d84ddb57560b4d5d569234a20b17fca1ae95f0

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