Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf83c6371da37de…

MALICIOUS

PDF

81.7 KB Created: 2021-04-07 00:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0953f1bf3d71d11874bfcac2942b6917 SHA-1: 08ea627e16b9f6ba075897c1d9c151cf12a3a25a SHA-256: 0bf83c6371da37deb578700a8b103a928bfec7b831491f473405fc9da5c493bd
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with many pointing to disposable domains and forming a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, though obfuscated, are consistent with techniques used to lure users to external sites.

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://kuzutuzo.ru/award?keyword=jurnal+medan+listrik+pdf PDF link annotation
    • http://itawegan.fun/how_much_does_a_dog_license_cost_in_passporto52do.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/HTijSjf/blacksmithing_leveling_shadowlands.pdfIn PDF document text
    • http://micrometerdigital.xyz/ribobazajai8rrh.pdfIn PDF document text
    • http://yildirimotobursa.com/dutenumy2d8.pdfIn PDF document text
    • http://bratskpravojur.ru/disadvantage_of_anaerobic_glycolysis_in_high-intensity_muscle_contractions1u05p.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/ii7Ldia/epic_seven_wind_rider_recall.pdfIn PDF document text
    • http://koxivesuvif.mypressonline.com/korupotan.pdfIn PDF document text
    • http://dreabling.online/devakakawunokurimuzewua1hfl.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/ciicjiW/electrician_apprentice_salary_2019_california.pdfIn PDF document text
    • http://myimperfectmomlife.com/xogirojesixemugujozela8tpby.pdfIn PDF document text
    • http://naturwow.space/englander_pellet_stove_top_auger_not_working3gv6f.pdfIn PDF document text
    • http://storedubai.shop/my_cloud_ex2_ultra_alternative_firmwarectv9f.pdfIn PDF document text
    • https://cdn.sqhk.co/tuparesoxaj/iSckhh6/art_therapy_degree_pa.pdfIn PDF document text
    • https://cdn.sqhk.co/tagorotage/0w1WMoU/rider_university_tuition_due_date.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vamipimepus.epizy.com/what_are_the_character_traits_of_god.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/gobevuvomodusuzofifiredux.pdfIn PDF document text
    • http://jemuvevidesa.epizy.com/c_manually_create_json_array.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_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 5240 bytes
SHA-256: 5caeef81383f14a97f4412c6ffa77a77ad3ef8a7862daad2b12afd6386e17dac
font_01_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 10912 bytes
SHA-256: 4db502eb23dc013b8446616e001baa5fdfe2012e80a953ee30a975a9f05247b8

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