Malicious PDF — malware analysis report

Static analysis result for SHA-256 63251e09e352f52a…

MALICIOUS

PDF

77.5 KB Created: 2021-03-17 06:26:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68c8488bebbf955cb3bfde7606181bdb SHA-1: 2fc628f2fbdf7525b588a920c8838011d871e0e9 SHA-256: 63251e09e352f52acbb185aec3946a1ac3e1ec9020a58078100ef7e48f90a648
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to external content, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=an+occurrence+at+owl+creek+bridge+discussion+questions+answers
    • https://fijuxibafituwu.weebly.com/uploads/1/3/4/1/134109117/tunumamija_xodiwok_lutone.pdf
    • https://cdn-cms.f-static.net/uploads/4483610/normal_5fd28a71791bb.pdf
    • http://marafonsport.site/dave_ramsey_gazelle_budget_tooljz0ik.pdf
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/raxokewijevoxu.pdf
    • http://samelike.site/5085455310rmv1r.pdf
    • http://babumoni.iblogger.org/buwibokutuxodinegezarixob.pdf
    • http://jezuxomedoz.iblogger.org/44755952239.pdf
    • https://cdn-cms.f-static.net/uploads/4413467/normal_602973d7d89de.pdf
    • http://begdas.fun/paginixodixunovexevetur49jkz.pdf
    • https://lepoboniw.weebly.com/uploads/1/3/0/9/130969744/dutunaruvufenodox.pdf
    • https://static.s123-cdn-static.com/uploads/4446774/normal_5ffaa9e1c9b88.pdf
    • http://onlinesos.tech/when_heaven_invades_earth_heresy0bvu7.pdf
    • http://xivasupati.iblogger.org/cathodic_protection_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/15b739f1-c2b3-47f6-bd87-0f3b0bdda451/which_of_the_following_chemical_compounds_is_covalently_bonded.pdf
    • https://uploads.strikinglycdn.com/files/8cc75554-bf3c-4dea-adf0-17abc69977b4/seek_ye_first_the_kingdom_of_god_bible_passage.pdf
    • https://uploads.strikinglycdn.com/files/dacc551c-cf90-47d5-9239-010d180cbb4a/el_guardian_en_el_centeno_pelicula.pdf
    • http://numebazo.rf.gd/who_is_the_highest_paid_state_employee_in_michigan.pdf
    • https://uploads.strikinglycdn.com/files/1b985bae-08a9-4a3c-ad9d-a2da60eeb6b0/how_to_set_up_voicemail_on_samsung_galaxy_s10.pdf
    • https://uploads.strikinglycdn.com/files/c98e3811-5d9c-4ff0-bc6e-d91603544d5c/what_is_hr_audit_checklist.pdf
    • https://uploads.strikinglycdn.com/files/3b61b44f-3604-4d0d-83c6-36763266dfa0/7675849592.pdf
    • https://uploads.strikinglycdn.com/files/29fc4def-717b-4c28-b086-908c09616d47/how_to_program_clicker_remote.pdf
    • http://lojogonofar.rf.gd/best_ladies_watches_under_2000_dollars.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd8.bin
7e49e9047a2c84969be903d3c0788ab92f86f63a77f48431028ff11f301bfa29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 5516 bytes
font_01_sfnt_off000102af.bin
ef249f01be4195673a1b4bf7eb63a1f7acef53734c265eb4f63abf02a470f099		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 11044 bytes

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