Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f2ebe021a3b47b…

MALICIOUS

PDF

77.1 KB Created: 2021-02-16 20:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 445118f206011b8d084c4167868822e8 SHA-1: 7cc4dea1f4ee14c67798bb42a53aeb0381f94699 SHA-256: 77f2ebe021a3b47be57546ff5df43246b06afaf0fad4772cfdd8efc82b884dac
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'seumenha.ru', which is likely a malicious domain used for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to 'Fluke 1750 pqm' and 'wkhtmltopdf', suggesting a lure to trick users into visiting the malicious link.

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://seumenha.ru/strik?utm_term=fluke+1750+pqm PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fd1c3818d6f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_5fe8b262a52e0.pdfIn PDF document text
    • http://kutifelafal.iblogger.org/20421775946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_601479a5a566a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457843/normal_601a264c6f672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466161/normal_5fee7b3a03547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_5fda6cfc1c31b.pdfIn PDF document text
    • http://sezituza.66ghz.com/bowflex_hvt_workout_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sowawobajomo.rf.gd/java_jre_64_bit_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/fojegodudedozetowigoma.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/date_format_uk_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/bang_olufsen_beogram_rx2_manual.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/80434884888.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/62653683894.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/video_maker_pro_apk_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/limesorarufetolezafosu.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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 5024 bytes
SHA-256: 9c1a61cece2bf08d2858a9a3bfcfe34a4a9396bcc0d7ad702391375b77e0daf8
font_01_sfnt_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 12360 bytes
SHA-256: 52edb0cb0923d702d1432a2e3f4b16a73e79050fe9c3024d6c0a30d2342975d1

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