Malicious PDF — malware analysis report

Static analysis result for SHA-256 889565a932b5b00b…

MALICIOUS

PDF

74.8 KB Created: 2021-06-08 16:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c38ace8f20a78d1c00ffa3380bebb554 SHA-1: 2171dee8f27c23158e6305b1972fa8386ada6dba SHA-256: 889565a932b5b00bf59fcb7ca8b599fe817c6813962d434990429620116e9acb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'cructi.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the malicious intent.

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://cructi.ru/pbw?utm_term=jio+rockers+sultan+movie+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485823/normal_606a1993b5b7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466366/normal_5fd85d5576ff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444622/normal_60594e2ddc75c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_60540a2da9f32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392451/normal_5fe2929d7be7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_605358e052f4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_600d0e9094665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_6062097ef06c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sekodegaxex.pbworks.com/f/91085162409.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423342/strong_adjectives_list.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/f/29043604157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0e668a-4810-486a-bc99-25463bbf2820/61573282999.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/bally_5000_plus_slot_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82301976-8e7a-496f-b9cc-ec41656f52a3/somuwubolujanifilubimun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6002fd48-6225-4b8d-861b-4721fbe97711/kizafajujiganisunipeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53f36d7-8017-4f1a-8b5e-1b6979e43d14/student_stress_scale_questionnaire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b15f375-e0c3-43c0-be61-1ce998894893/86371758456.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/f/newuroriduloseviderupepub.pdfIn PDF document text
    • http://degagogo.pbworks.com/f/dual_whatsapp_apk_free_download.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_off0000e710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 5292 bytes
SHA-256: 6761e9013981279113953377cddec07355e05d5df575e420d381bb93b0a4912e
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 10872 bytes
SHA-256: b612fb720fdcd08cf65d296421c4af510b9121638d055d354711efdcf76d6175

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