Malicious PDF — malware analysis report

Static analysis result for SHA-256 86456941c7f1934a…

MALICIOUS

PDF

70.1 KB Created: 2020-12-04 15:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 42f7d1b6984582fcceb04504c76bade1 SHA-1: 50e0396e7b9591d3e9775e14dc6373e754e186d3 SHA-256: 86456941c7f1934a3a2fc40e196524214e436efd8203304515c895c28e585e74
104 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier, indicating a phishing attempt. The presence of an external URI pointing to 'trafffi.ru' suggests the document is designed to redirect users to a malicious site, likely to download a secondary payload. Although no scripts were explicitly extracted, the PDF structure and the ML detection strongly suggest malicious intent, possibly involving embedded JavaScript for exploitation.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/123?utm_term=aci+318-14+pdf+espa%25C3%25B1ol PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d27e2e74-56fa-4c21-aac6-62fa8fdf2433/assistant_district_attorney_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3adeb079-9077-4222-9064-6b52862d33b0/55880965578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499cf397-ff19-410b-bb3e-3c64881173e1/85993550296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/202dfc0a-d3bc-4306-85c9-92c599d25623/19928756714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d26af0a-1cce-4829-bbce-716153958e96/98900940422.pdfIn PDF document text
    • https://s3.amazonaws.com/xotorulu/pixelaguvoxakof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d977bc-0509-4cba-8acd-86d32411d591/53072540439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6adb07cf-7916-4dd7-af2a-d2ee53f35750/mortal_kombat_icon.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/gafusa.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/heathcliff_wuthering_heights_tom_hardy.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/fitted_bed_sheet_meme.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/arabic_phrases.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/irish_potato_famine_ielts_reading_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77bdbe6f-8a81-4b45-9588-a5d2784e8917/41960034624.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66B 5384 bytes
SHA-256: 5f5da3048b16044b48caa429dbed4096fb81ee862cff192485859047d4ce582e
font_01_sfnt_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 10224 bytes
SHA-256: 903fc24074962e1967a5a485579a17eb95b5d32f5ed51e6c6201d5834f93fbea
font_02_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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