Malicious PDF — malware analysis report

Static analysis result for SHA-256 542c1ba6078b4dda…

MALICIOUS

PDF

76.3 KB Created: 2021-03-28 12:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6db222dea4ca11d3dc6bc72d245556e9 SHA-1: e6aabb18e4e686f3bb157fa5834f252bc686e7f4 SHA-256: 542c1ba6078b4ddaabcb28a49b7f812df9051be23f66ac7d1fd50e7ae80533f3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of external URIs and the ML classifier's output strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/123?utm_term=cold+chain+management+pdf PDF link annotation
    • https://cdn.sqhk.co/poxedomeke/nhfI5fN/battleship_online_2_player_unblocked.pdfIn PDF document text
    • http://medyayazilimtr.com/gixaxilinuwitopujenumidutew56d.pdfIn PDF document text
    • http://lumacy.site/patibi6xcx1.pdfIn PDF document text
    • http://axacheat4.xyz/equalizer_tv_series_episode_guide41k9q.pdfIn PDF document text
    • http://sewonmedix.ru/78188135655o7xo8.pdfIn PDF document text
    • http://noksipals.online/gexonupoborikudusugeka2d7f.pdfIn PDF document text
    • https://cdn.sqhk.co/tigoxexuda/bicjgqc/sago_mini_robot_party.pdfIn PDF document text
    • http://hamlikjorettoop.ru/bipopewg19y7.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/iIjhZhc/nobby_beach_shark_attack.pdfIn PDF document text
    • http://3-bureaureport.info/fipokixxehsb.pdfIn PDF document text
    • https://cdn.sqhk.co/vigibizez/jeiicMC/pojakobedu.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/sgjhjUG/93646461998.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/ic2idid/best_cnc_machines_for_home_use.pdfIn PDF document text
    • http://reabook.online/5426186319p3cb2.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/yFDiijh/62545422623.pdfIn PDF document text
    • http://apparently-home.com/ms_driver_license_status3gicm.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/bDigjbv/83634997692.pdfIn PDF document text
    • http://cmbclientes.com/507246137158q0f9.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/ef8ec637-f40a-4924-8944-e5983d886881/suzobir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f11119-df3b-47be-bb85-fe76642b5989/cant_get_pilot_lit_on_gas_fireplace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389a8355-a5f4-45be-a5cb-f824122222ef/nugagorogerujakukogir.pdfIn PDF document text
    • http://poradenojipedu.rf.gd/typing_practice_sheets_printable.pdfIn PDF document text
    • http://gaviguxugopa.rf.gd/ibm_technical_support_interview_questions_and_answers.pdfIn PDF document text
    • http://rujesuluxure.rf.gd/cookies_netflix_gratis_blogspot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd0b4b2-a91c-416e-9ff0-8a28c59cd1ef/73277166641.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_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 5200 bytes
SHA-256: 0adf13b1772b9b96158be2b56e92cabe2770b5415258f1cbe5feb129e2bbec1f
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 10336 bytes
SHA-256: cb8f7f1944691e1531e81a416450db5f049d92a7d7a2ac10e3b9f5fa825ad7ed

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