Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40ab3f478b971ab…

MALICIOUS

PDF

67.3 KB Created: 2020-12-19 04:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 40395a873527ae112f8abf1cb6ae83a3 SHA-1: 7aa0caf541874c5fa687f98976f2e6795fcc1d27 SHA-256: b40ab3f478b971abaae9ff9b302c74b9a87398d5c830d2f2d6e995d5b3ac6ef5
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. The embedded URL, 'https://traffset.ru/strik?utm_term=2.5+carat+diamond+ring+for+sale', combined with the document body's mention of a '2.5 carat diamond ring for sale', strongly suggests a phishing lure. Although no scripts were explicitly extracted, the PDF structure and the nature of the threat indicate potential for embedded JavaScript to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=2.5+carat+diamond+ring+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5f8b0f0a2e4f3.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/8eb60b30-2684-4313-8e2a-496cc752c47c/community_resource_and_referral_center_dc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e1448ef7301f8b1097bc/t/5fcc242ba87f9f1b19c91b1c/1607214124240/lulakobisenofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b4e893b-09f5-415f-9c17-5a77b33e6f90/wedetoworopazupepixivili.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12254405d5340f32af944/t/5fc5da117acac6192a8cc991/1606801937515/star_wars_battlefront_ii_ps2_iso_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/paradise_lost_book_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef5a69b-29bd-4152-b3a7-34862b8a1410/92349900775.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2aef80b6b03258f41001c/t/5fc492db173fb5383b35c4ae/1606718172083/uniden_r3_sale_canada.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5406c7d0c8f249d5d8b91/t/5fc9536b45739f54780537d2/1607029611799/heroic_couplet_meaning_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/mastering_hurst_cycle_analysis_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd4de1bc08de7cf0659d48/1606241762107/lixilofuxuganipowapuk.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_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 5532 bytes
SHA-256: eb1b12a65bebb0e93c866da2b2b6902bf9c8157498ade589688052fa36001a7f
font_01_sfnt_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 10108 bytes
SHA-256: e4e7c861401750d80867e89b3201c9ddcef5344e647c929e8cb4c5bfd228c789

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