Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbf3119005851e7…

MALICIOUS

PDF

77.1 KB Created: 2021-03-21 09:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 08052af370609061e2acbfd3521c5974 SHA-1: 93dfce4d901b0daafdf200923f940a9dab8bf23d SHA-256: 0bbf3119005851e7727f903deeb985715cea2ac67a8931e4071f845f0077fb3e
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to 'periodic table of elements riddles answers', directing users to a suspicious URL. This indicates a phishing attempt designed to trick users into visiting a malicious site.

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/wix?keyword=periodic+table+of+elements+riddles+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461498/normal_6011f2716a14f.pdfIn PDF document text
    • https://cdn.sqhk.co/zonurubo/cjNibhb/moomin_pop_bubble_tea_bar_ari.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzabajixiw/TfidQZS/gavovumeditabibadok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_60469020b083c.pdfIn PDF document text
    • https://cdn.sqhk.co/wijenipa/jdd7ihG/instagram_story_templates_psd.pdfIn PDF document text
    • http://verifybadgehelp.com/how_to_change_picture_size_on_philips_tv_without_remotezuven.pdfIn PDF document text
    • http://accueilcmb.com/pathfinder_player_companion_familiar_foliok6yak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_60247f20cfb21.pdfIn PDF document text
    • http://qrettalq.online/parasound_a23_manuallrkc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_5fe7beedd1505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_e87243092fe645ce95ac3cf08e318e31.pdf?index=trueIn PDF document text
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_942770e7dfab48e2aac014092d1cd554.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaeab5ba-34c9-495a-b1da-be466f457418/home_interior_design_software_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/250d17e7-1908-4950-b5b6-c87b55293f19/which_element_has_2_valence_electrons_in_the_2s_sublevel_apex.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_b4477fb1167b43a6aaec1820bf3dce95.pdf?index=trueIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_dea417613bfc4d8a9bf6caef081b4821.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_e2295e064c004f549fc828bcd526d2ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f884a02-4ad2-4a72-bd6b-ab15ea629be2/fiveparoguv.pdfIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_4c172cee80564c4e97429d74aa99ed30.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_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 5400 bytes
SHA-256: f24b19d9893aca5da149bf90db76e081ef2a7d0f4d4bfb91272646e301af1780
font_01_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 11420 bytes
SHA-256: a27594efe994ee1652433064e93481b6061292e2041b1a2631888c2249d68aa6

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