Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3cc907c737d4fc…

MALICIOUS

PDF

71.7 KB Created: 2020-11-19 18:11:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a58c1665521d4cc20da9334bf335b5f7 SHA-1: d7618115a091f5c99e31bae885f193267765d7a5 SHA-256: db3cc907c737d4fc7c08ce539c359700ac46ead7c0a0be2f31d3573580cbcb36
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a heuristic indicating a visual download button and an embedded URL pointing to 'trafffi.ru', suggesting a phishing or malware distribution attempt. The document body, though partially garbled, includes text related to downloading, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=how+to+download+stuff+with+mega PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454556/normal_5f9fe2d5ae500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f8e8ee7aaa6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f9b91a11e7e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445331/normal_5fa95732aab0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408864/normal_5f9d83a15ac4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5fa6a4e41317b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5faeefec3ed9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5fa42312ec015.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/a52eaa7e-5e4e-4723-a3f9-fa229ce124e9/vusigoxavijubazimukagas.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/dolamokarudexufod.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/nipukejakaguzaxepupiju.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/explosion_box_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a75860-7aa1-42f8-be1e-809153563c4b/26631640865.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/screen_share_app_for_firestick.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/sedepavunifenipugelovasa.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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 5276 bytes
SHA-256: 40b24bdd4b94f1b33318c8ef38b58fd91f910e407f41b439e45112c1b50ba268
font_01_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 10692 bytes
SHA-256: b7d7bb17559fb1f02243fa9eb6b66b3a3312865a3a40e3e134741b50954e7187

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