Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2a031c3384406e…

MALICIOUS

PDF

92.0 KB Created: 2021-05-04 01:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 896da551685abc5f38484b5ee38915d4 SHA-1: 19ca7118c938c2411ae10d79a7e275ac43c2ca8b SHA-256: 3a2a031c3384406e176abbce42dd059179179659cc8688baaa4db9dcf53c9dca
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 0.9996

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://pelibifir.ru/strik?utm_term=what+does+type+of+employees+supervised+mean PDF link annotation
    • https://cdn.sqhk.co/sozodumupof/cghTfhf/can_you_escape_adventure_level_7.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/iahdjiE/pokimane_age_height.pdfIn PDF document text
    • http://sellforce.ru/rajewubulakuramated2ma5v.pdfIn PDF document text
    • http://nicepics.xyz/bevaladunebenefolis8kf5b.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/qjfe2QJ/koi_live_in_fish_tanks.pdfIn PDF document text
    • http://wgathering.org/9519794428661y44.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/aBmhcxE/starz_movies_october_2020.pdfIn PDF document text
    • http://cabinetsop.xyz/samsung_bd-c5500_remote_codejhwar.pdfIn PDF document text
    • https://cdn.sqhk.co/runolisor/LggHDhi/bekisowifasonabimozisobo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_b99e90f375454fd7bb87ed3e898eba92.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_fd88aed001534005b4a584f5740c4c82.pdf?index=trueIn PDF document text
    • http://lixanixuzuki.rf.gd/11202098045.pdfIn PDF document text
    • http://debubiduselez.epizy.com/latest_background_eraser_app.pdfIn PDF document text
    • http://sitotozip.rf.gd/xujumaromunu.pdfIn PDF document text
    • http://pibonev.rf.gd/linisemifabesutonukoz.pdfIn PDF document text
    • http://rupijelovugibiz.rf.gd/solar_system_planets_information_in_english.pdfIn PDF document text
    • http://jimotomalugeji.rf.gd/free_catalog_templates_for_microsoft_word.pdfIn PDF document text
    • http://dotenax.rf.gd/norton_antivirus_software_for_windows_7.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_87f005376a124aec85c8dac28e64a3d0.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_69b1bc51a65646d2a3b4f7fc1e2d4cee.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_de85fe2da24847dcbf537ef896bf46b3.pdf?index=trueIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_09e62caaee404a2baf98e32cd735cdec.pdf?index=trueIn 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_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 5456 bytes
SHA-256: 8ea518a7dd5fc270db7196e352437de4fee0735570f5ffc527ad13a825af9873
font_01_sfnt_off0001409f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409F 9868 bytes
SHA-256: 61b9a2ddd5de22ae6f5fd166efe356af4d8ef0190af19b2eb6c68505361dfa1d

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