Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c07e992978fa2f…

MALICIOUS

PDF

75.3 KB Created: 2021-04-24 18:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1b1eae8f410e134a4c79ac3ff29d95e8 SHA-1: 06011668c8292ba55919ce2cf80b516e52505b33 SHA-256: 13c07e992978fa2f3eb77353e05c8c6c46dc898691d8a4914dd85943a1050e42
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=radio+shack+mpa-250b+manual PDF link annotation
    • http://memaruve.22web.org/65942342011.pdfIn PDF document text
    • http://zawotagulokexa.iblogger.org/44e_hall_effect_sensor_datasheet.pdfIn PDF document text
    • http://100naturals.fun/how_to_sell_grey_market_stocks232wu.pdfIn PDF document text
    • http://jushq.club/android_linux_terminald1gmd.pdfIn PDF document text
    • http://juzonot.22web.org/python_programming_bangla.pdfIn PDF document text
    • http://tumbochka.space/java_interview_preparation_guidecug83.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/ginezozis.pdfIn PDF document text
    • https://dirusase.weebly.com/uploads/1/3/1/0/131070798/4348104.pdfIn PDF document text
    • http://zupubovogigu.iblogger.org/nakadabilapipite.pdfIn PDF document text
    • http://leaninrzpd.site/incident_report_sample_for_nursestw9eu.pdfIn PDF document text
    • http://mysteps.online/japan_travel_guide_free_downloadhtyl3.pdfIn PDF document text
    • https://gutinevar.weebly.com/uploads/1/3/4/6/134611255/sibobobelor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loratozojakin.epizy.com/xufota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38151cd-6b9d-4891-8db4-a385788a13b0/the_redemption_of_time_synopsis.pdfIn PDF document text
    • http://vefafovapekaxa.epizy.com/barron_s_sat_subject_test_biology_e_m_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a6be06-b63e-486e-bd52-f5be76f63ebf/lyrics_to_cross_over_to_the_other_side_of_jordan.pdfIn PDF document text
    • http://nodimetonakijeb.epizy.com/tukakagavusuginebenekojaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12c96bf-c538-4dce-b8c2-fc8cc3208956/hp_laserjet_3015_fax_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282b9f91-e6a4-4ccc-beaa-b0b166ad9737/how_to_reset_usb_spy_camera.pdfIn PDF document text
    • http://pagupim.epizy.com/reported_speech_past_simple_perfect_english_grammar.pdfIn PDF document text
    • http://mijuguxugatuk.epizy.com/dcms_report_module.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_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 5860 bytes
SHA-256: cbf4ea00e9068608bbbd9b747d0fae285df138cbff94e09025787a7fdad5d8f1
font_01_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 11812 bytes
SHA-256: 6a3d7dead7cf25c8b5d139456d3575156ba3a93cffa7aee5a0a7e58f71daa428

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