Malicious PDF — malware analysis report

Static analysis result for SHA-256 67695dcef36dde28…

MALICIOUS

PDF

78.7 KB Created: 2021-05-29 14:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fb19978fa0efa501d9bde1b8dd3cfe06 SHA-1: 33f40d844b672e9bc94f78eaba583500a94af626 SHA-256: 67695dcef36dde28ae20f463b7188449ee59c040791db16863d5d08d667ab625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or distribute further malicious content. The ClamAV detection and ML classifier also strongly indicate maliciousness, specifically flagging it as 'Pdf.Phishing.Trojan'. The primary IOC is the initial URL that likely leads to this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=simple+present+tense+affirmative+and+negative+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476146/normal_602e229bd0b8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_6026b3e895d61.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/7f7610efb52f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482872/normal_601eff9849010.pdfIn PDF document text
    • https://suxosuliresud.weebly.com/uploads/1/3/5/3/135351283/1824604.pdfIn PDF document text
    • https://bimexojagof.weebly.com/uploads/1/3/4/6/134655387/bulebaturaji_fexopasilijanef_ramar_nojufufaxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fc5ea51bd399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490950/normal_6064e9da8fb40.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/72cfd6c8-629b-466c-9f50-1ac2277d1758/45020977735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0495cc8-5736-4136-b8a0-706afd07ebdc/71890601681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6da44f-5e76-42e0-89d8-30431045066c/kolakatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/893b43e6-1c05-4044-8a80-f6285493cc1e/55791652003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff10bef6-f2ec-4f4d-a2ea-a5e4b61183b6/jezifiwowalivusogevolevub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078d8f1c-5e60-4fae-b7cd-6cfe8a7d8de4/scorch_trials_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8247acad-d83f-41f3-9397-5c3f314074b3/30431524867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d13209-f01b-47b7-8aaa-086c8b8786d6/taylor_food_scale_manual_3919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d927b65-58f1-47cd-912d-229604f910c7/how_to_learn_draw_faces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64eaa4c-b0ad-4643-8747-18fc03550ce0/19440610081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce41c2b-921b-4bba-bf4b-a2bb00fc5ab3/43835473338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eba98cf-a126-4117-914c-60ce2f485667/the_eye_of_minds_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2fcb10f-73f4-4e42-89d4-3ff29a712566/howl_poem_with_line_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d983ceb-904f-4b55-a95c-6b0bf59cb0e3/does_2019_mercedes_glc_300_have_apple_carplay.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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 5708 bytes
SHA-256: bb17ca35328c7362874cc4e1090a418ed0b61fa9762274853d2d46608828f497
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 11332 bytes
SHA-256: 7af9c7c1cc1aac0e756e983efcff443f3ee8a1e7453397c4481235e37f52289a

Open this report in the interactive analyzer, or submit your own file for analysis.