Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50fad8fb42b009d…

MALICIOUS

PDF

91.0 KB Created: 2021-06-11 00:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 156f870f433d1266dc2a6f2c0db96ef1 SHA-1: e479b2fc112cce8582fef5bde47dfb6b134211ff SHA-256: c50fad8fb42b009d6386cfc3b6d8efad9c9852919ec29a4a66a2a417ecc6bc4c
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to 'crewmak.ru', which is likely a malicious domain used for further exploitation. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a harmful site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://crewmak.ru/pbw?utm_term=forest+ppt+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379859/normal_6009c7a1ee55d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382429/normal_5ff3b137a4157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_60192138211fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_60baf3f51d813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_6027387926891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_60233401abd75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_601c05ec61537.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452206/normal_5fde2ddef2a91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_603e1740792c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467019/normal_5ffcb7a2b1b9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489415/normal_5fe2252c0bc69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379369/normal_5ffb406ea8e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_60b8f4fcba58a.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/2fd998b8-85f4-492f-ad0a-ed0f4e0b4adf/used_minn_kota_power_drive_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b92e03d-e265-471b-9861-71812dc55bf5/emerson_tv_remote_control_app_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ffb138-795c-4252-9ad6-dfc8d4f48c5f/debujugogoxopekilidasojud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91585328-9774-4040-9c7f-ee901e89420f/monedasatufofokakexom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b12491f-f94c-44f0-87c6-6973deaa4a7a/how_to_use_a_cen-tech_digital_multimeter_to_check_voltage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef474e2-0c5c-4617-8cbb-82be44ae8e40/41802537202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/918ed354-656b-43c6-86ff-63fce910b126/dubujasififem.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_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 4920 bytes
SHA-256: 17bf5d640baf9320f214cc5c0ee7e5a103f3764d3996dfad517dbd03998fba12
font_01_sfnt_off00013a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A15 10720 bytes
SHA-256: 1add4a061bed34a166dc1ff8eb410320f7372c5e1fe547241c907f8eb6b0d183

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