Malicious PDF — malware analysis report

Static analysis result for SHA-256 218cc644723767df…

MALICIOUS

PDF

62.1 KB Created: 2020-11-24 04:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 477c7ef48589a0579477246ea4a1691f SHA-1: 262770005b33b3dfabae684e42daed4f73ac3175 SHA-256: 218cc644723767dffa0bbcc9344d9d4edd6e3ddb94f38a3c023fe9d601211aaa
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating an external URI and is flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The embedded URL, 'https://trafffe.ru/strik?utm_term=tutorials+organic+chemistry', is likely used to deliver a malicious payload or redirect the user to a phishing site. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to exploit the user through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/strik?utm_term=tutorials+organic+chemistry PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443329/normal_5fb81bc210701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5f8d3e7d88adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5f91011b7b6a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_5fb97d0ae288b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_5fade4abe9280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f8bb5f9946ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5f8848be8c9da.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/jukezeluf/episode_guide_riverdale_season_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a37641c8-19a3-4992-8833-7a1e4202d454/minecraft_tree_house_schematic.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/rupinder_gandhi_movie_free_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/xusagirobab.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_off0000b708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB708 5264 bytes
SHA-256: d1f177fffeaa80613180823ccaf0812eabaefab10389eb835f5f20be8ff273b8
font_01_sfnt_off0000c8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C6 10372 bytes
SHA-256: 12dd746fda705e00f6011c251d46f5656a592296050ff61baaac4a5dc5e26d57