Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb14ce2b9fd63fb…

MALICIOUS

PDF

68.7 KB Created: 2020-12-21 05:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 25289016ef268c49fec50169c008ba3f SHA-1: 54b25651f393d92401b4ebbcd4e593113db1ee6a SHA-256: ffb14ce2b9fd63fbbdc9d083381e3037f9d2591c2ce89017c9717246b3ec82cc
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of an external URI and a visual download button. The embedded URL points to a suspicious domain, suggesting an attempt to trick the user into downloading a payload. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of a download lure implies a phishing or social engineering attack.

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://traffset.ru/aws?utm_term=introduce+yourself+in+french+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5f948529377bb.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/faluzotixupi/76158959640.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/22378603630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca79c53-da1d-4bf7-a8e4-a6af8d47d069/vetofiniruruvuwowos.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/word_for_answering_your_own_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dcac507-c3a5-44d0-bc1d-62bf8ea3d1bd/rock_city_park_tennessee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88939c7c-a82c-4860-9d40-997beeb0a393/kagogimulexade.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/1st_grade_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/roxumime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5dd2414-80d3-4055-8478-4123108d65c8/nasupikoxobenuze.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/halftime_report_call_of_the_day.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e90c27a199023ab56552/t/5fc54f704e98326c02c10d00/1606766449500/98041727551.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/wunaf.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/megacubo_2020_latest_version_for_windows_10.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1D 5096 bytes
SHA-256: ffd9e6fc5c4915fdfdd92e6ae767a1850c49110171d9979ae49730f345eaf5ea
font_01_sfnt_off0000cb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 11136 bytes
SHA-256: 8b72844c8cf492cd9d20d7dee70a7bc9f0a80ba8fa1b5a165d7a7b6d4574b966
font_02_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 16084 bytes
SHA-256: 8429237fcd208046732dac0a1d3d9e050e1ac7d6002e8beabdb17c1f23499229

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