Malicious PDF — malware analysis report

Static analysis result for SHA-256 44acf640ac0c3cc2…

MALICIOUS

PDF

68.2 KB Created: 2020-12-08 10:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 71051dd0bff485d1287baea960a6b606 SHA-1: b8e64483cd8596d7531883d108e73e82c126564c SHA-256: 44acf640ac0c3cc27882a9ee145a8e6d9a354b14ec592880aa352b80f454af40
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The embedded URL leads to a domain associated with malicious activity, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure itself contains the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=knife+sharpener+walmart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f8c13926612c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_5f9a1198c5e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_5f999bd845fc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_5fbbd8021032a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_5fa9bcaed8a26.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/d5dad35e-4a87-4cc4-a7c6-46ab9c67de6e/mebin_yasaklamad_ark_siteleri.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/silukutux.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/puppies_for_dummies.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc514f6bf71053ccb2ab590/t/5fcee343b8233e30df9c76b2/1607394116445/auto_diagnostic_obd2_elm327_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/99084118920.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/graphing_standard_form_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/bright_memory_mobile_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0452f40-2ae4-40e0-8daa-84bbf1063304/perekawotek.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_off0000cebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBB 5200 bytes
SHA-256: 47437b74414762524bae01f93970ab4b74fadf3e45f13558fb199049025c090e
font_01_sfnt_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 11012 bytes
SHA-256: 1c7693a2a0a13e187ba359516b3e1e2060a2adc5a05708cd49a759aea94220a2

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