Malicious PDF — malware analysis report

Static analysis result for SHA-256 8088a679b7913597…

MALICIOUS

PDF

77.8 KB Created: 2021-04-13 06:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fd1915c19c522e2ea523cefa3869bf42 SHA-1: 79b4569eccd7cc99b573ec5e53dfa0f90c3a2807 SHA-256: 8088a679b7913597cb68f639b054d43dc8efdec337a42dbc421033a98543b92e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, suggesting a link farm designed to obscure the ultimate destination. The document body, though heavily obfuscated, contains text related to car maintenance, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=how+to+check+transmission+fluid+2008+vw+jetta PDF link annotation
    • https://cdn.sqhk.co/ganuniwiku/jfQlxhc/london_brighton_vintage_car_run_2019.pdfIn PDF document text
    • http://load-bcp.com/60069170661gw0f6.pdfIn PDF document text
    • http://khareedforosh.com/5-6_law_of_sines_practice_worksheetdpvpm.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/HmjcIgf/kivewotawekipijufeledinez.pdfIn PDF document text
    • http://frasqen.online/giteterowetikukodobe4e6ly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407997/normal_5fe5c62a3c840.pdfIn PDF document text
    • http://chelamela.org/vw_routan_transmission_fluid_check7f6qh.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/vjhXb1r/steam_table_engineering_toolbox_bar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494138/normal_60518a1babf2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5ffa7f2d59416.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/1bc7daf1-d1dd-49aa-a347-e53d5a772c38/how_to_break_dormancy_in_garlic.pdfIn PDF document text
    • http://sekusasumoda.rf.gd/20391049914.pdfIn PDF document text
    • http://roninifuwevol.rf.gd/vokabinukivikowon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23faaffb-8216-47d8-b003-df882a9cb387/siluxologoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee0b88a-85f5-4453-b245-54f009133b06/44559201893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d48f0b-9041-4413-8420-a55dcf5790c2/the_golfing_machine.pdfIn PDF document text
    • http://gitatujobewati.epizy.com/quantitative_methods_for_business_12th_edition_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5914f004-54ec-47a1-86cd-cee261e0bf17/how_to_use_periodic_table_in_sentence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa20fc2f-a470-492a-8c35-3fa97770424a/best_internet_service_provider_in_lohegaon_pune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f011ca6-1643-4126-96dc-b97b0d37ef84/wufidesarabalaw.pdfIn PDF document text
    • http://pinakebe.rf.gd/industrial_instrumentation_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122e1dca-1732-4410-8d13-5a309d481c2d/bose_sounddock_troubleshooting_no_power.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_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 5984 bytes
SHA-256: 76504e95311c0e68f368067d333126e260173e38b09f97e1824a7426bbc61a78
font_01_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 10792 bytes
SHA-256: ab7723c34e758a97b945db6b631d225107cec6668b1c9f6aab059b3ac7522db3

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