Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbc99c486e373e3…

MALICIOUS

PDF

74.9 KB Created: 2020-12-19 09:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3dbd7594622ffb7e12180196788e55e6 SHA-1: 2b1e85f0df239cd351cc6c74f43b7133783c529b SHA-256: 8fbc99c486e373e386cd4f06416e560588bc924e39cef3d5b86ed2009b3fda3a
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'trafffi.ru' and a heuristic for a visual download button suggests a phishing or malware distribution lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'mtg arena mac issues', potentially part of a social engineering pretext.

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
  • 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=mtg+arena+mac+issues PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5fc49c27c0f9f.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/jusuberu/kopobazepovog.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/pulimufexisimewajoba.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/coding_guidelines_for_diabetes_mellitus_type_1.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/77397412538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de48d0c-bbd1-48bf-8f7d-08b02405cb80/ninuzufixeloteguworagate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dffefab-ff31-4a5d-86f1-bd33314a2ff7/73612689658.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcb8173599a867de449200/t/5fdd24660ad63e4c88bc4b53/1608328295174/fair_work_australia_termination_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9af700-3aca-4c2e-be71-2fa2306258f3/xaxifize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8daaa8f5-9998-4d48-a836-3002fce87ee0/nojixosopemusadudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ae84ea-f1a8-4cab-8e52-7af3563dbc3d/65182046778.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/67524381297.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/gtx_1070_ftw_overclock_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/modern_england_history.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/sales_process_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/branca_de_neve_e_o_caador_livro.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_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 3016 bytes
SHA-256: 6b1886100909a5777bb30fc7b7be00bba8ed48ad5f5b392b7a0cb4783a0739ac
font_01_sfnt_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 5092 bytes
SHA-256: 1c04b3ef2ffa88bc66148bfc1b3323902d35a0ced7b2a8ff327932f98abc2e2a
font_02_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 12100 bytes
SHA-256: d9b0c79c25f325eb510a0a22088a87426250555ae22f253982ad202d85b16ec1

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