Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41c208730b85af5…

MALICIOUS

PDF

69.1 KB Created: 2020-12-17 06:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7bef65f1feee059466267c08022334a7 SHA-1: ae0a5da6962d2a8f80b79a7cfa36fc798e9dc57e SHA-256: e41c208730b85af569b671b3a220eb3184911035099af4cd2affcee762d00365
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafffi.ru', which is likely a malicious domain used to host or redirect to a secondary payload. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of multiple embedded URLs, some with unknown reputation, further supports the phishing and malware distribution intent.

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://trafffi.ru/123?utm_term=lucky+number+dream+book+free+download+pdf PDF link annotation
    • https://todijedesat.weebly.com/uploads/1/3/4/7/134775475/vosubizilonatone.pdfIn PDF document text
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/zozikepubofuleb_fenigikuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5fd68a07d2748.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fce3d6c8a652741489ba5e5/t/5fd10e501f86e027fbaeafa9/1607536210451/lasodinagevezajam.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/editor_de_video_para_android_full_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a834abaecd33182d7d6c/t/5fcf30a5faf0bc04d1c6fe4e/1607413940350/pacify_into_meaning_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/bohr_and_lewis_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/tsotsi_athol_fugard.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d0c6791da6493f6663f7/t/5fc8bbb7e101942bf7779918/1606990782397/wordpress_plugins_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/classical_theory_of_algebraic_numbers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27b7e60f2895dc1f1e23b/t/5fc57517fa04221c71d9052b/1606776090375/17157320878.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf2bbecb3b830a1a321236/t/5fd722b35b1f6f7539ef7881/1607934645064/33989967180.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_off0000cdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFC 5464 bytes
SHA-256: 1944122b3a830871da240a903c92e40be5bcba2899f00445850479b8c01f95ed
font_01_sfnt_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 12024 bytes
SHA-256: 38f29fc9067ba3afcb6d9a2320d4e00452833a4933df1aff710115aa264853af

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