Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca546cffa33aea7b…

MALICIOUS

PDF

83.0 KB Created: 2021-05-25 14:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f14d98cc92f21a2db212618ce0fb6012 SHA-1: 53e0a8ec3767f1082ec9d1fc077ed0fbc0efe7d3 SHA-256: ca546cffa33aea7b4865bbe55f2ec226629b2e6e386ed056a0dcb7219a33394e
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/strik?utm_term=public+speaking+tutorial+youtube'. The ML classifier also flagged this PDF with a high score, and ClamAV detected it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0'. While no scripts were explicitly extracted, the presence of a malicious URL strongly suggests an attempt to lure the user to a harmful site, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/strik?utm_term=public+speaking+tutorial+youtube In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_60446d508a28e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fe7900ae4adf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fe16a65bd052.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377388/normal_5fec671be0aa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_60676f41881ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/bivumatogenemefekudul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c98c6d9-1dc7-4823-99bc-832f72f96667/uppababy_vista_configurations_with_car_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37be4880-ce6d-4c6f-88f9-345825399142/how_to_use_a_poem_title_in_an_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/82975416981.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/epson_v550_scanner_best_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b39cdc84-8417-4438-a5c9-912fd4e69237/mozivifibapinubakefafom.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/17131671158.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/38048351602.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/interview_questions_to_ask_a_daycare_teacher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd1a3b7-6a37-4762-8a92-7224618effd8/how_much_do_general_managers_make_at_planet_fitness.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/mixubugojarunimelubanos.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/fishing_report_ct_deep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/623a444f-4149-4daa-8078-25b69352a280/jesavawepopunerimopivuze.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/what_sun_sign_is_april_20.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/getatirexad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c77f4d6-cced-4a69-9e05-b606dec6e2ca/how_to_reset_rainbow_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca35cfd-bedd-4e8f-884a-ba00777e1be3/wegedowemizizizefefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37834030-e4da-4722-a904-be868a98f4fe/how_to_tie_a_double_knot_bracelet.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/black_desert_online_size_2018.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_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 5408 bytes
SHA-256: 73d6b5301ef9c434749e5e3451382332fe4c58e5d801c6b292c087bc639e18b5
font_01_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 10572 bytes
SHA-256: e09048549fc9e027fe731961d0184e725c94c9c0f9775230d2ecbb9b7ce7237f

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