Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bec7c9bdc814867…

MALICIOUS

PDF

92.3 KB Created: 2020-12-28 20:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0edce7aa0b0d71303138ce2a8f6355a1 SHA-1: b7b8b1a6bf14259aa5e42ecde9d7549be0ff34a5 SHA-256: 9bec7c9bdc814867c7a34cf22f2d5cca396d5dd98ea43ef864953c039a00225f
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 as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'trafffi.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'frame layout example', suggesting a lure to trick users into visiting 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://trafffi.ru/aws?utm_term=frame+layout+example+in+xamarin+forms PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5fea062518b63.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/heEjejz/48084282259.pdfIn PDF document text
    • https://cdn.sqhk.co/gilitejeku/Igdchei/file_manager_hd_apk_old_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_5fbb909adaba3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460042/normal_5fcd7d6df1665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5faf9f8da859b.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/OEKWPgj/62494711698.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4abffa1e-d822-49e9-a360-0da33b693a14/bobenibakel.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/weather_report_today_in_goa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f0fdef-2b9e-4b92-99fb-47e2733ad399/66088476177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12d1e99e-2ead-4bf9-86f8-65bd60ea2bf0/82359903219.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/words_that_start_with_ceph.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/43005910901.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/40732555522.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 5056 bytes
SHA-256: 6fd419d6fb533690e387312742827a5cce3718fcecc48167a54b05239dfbf66d
font_01_sfnt_off00012d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D05 12032 bytes
SHA-256: 87e4356cfe39774863a0102a9a92c0fecf7c2cd257854641673dd87095119953
font_02_sfnt_off00015603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15603 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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