Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09771f18d042911…

MALICIOUS

PDF

69.2 KB Created: 2021-03-28 23:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a100737ed6893f8d98f8fb5c9bd00e56 SHA-1: a9fb850bd52dfe1b0b8810cc1c0de1f53a0badcf SHA-256: a09771f18d042911c85038d632bc162067d3f56a5364d453201fb48ef86e64e1
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, with the latter identifying it as a phishing trojan. An embedded URI points to a suspicious domain, likely intended to host a malicious payload or phishing page. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=little+tikes+totsports+t-ball+set+pink
    • http://wurilozi.scienceontheweb.net/crochet_hat_patterns_for_beginners_youtube.pdf
    • http://kersita.space/pitubekanadebaterribgg.pdf
    • https://turudesufexo.weebly.com/uploads/1/3/4/1/134131379/widoxudesemep.pdf
    • https://relabibede.weebly.com/uploads/1/3/2/8/132816075/6174046.pdf
    • http://vuroxinizona.scienceontheweb.net/can_you_terminate_rental_agreement.pdf
    • https://lejumapufa.weebly.com/uploads/1/3/4/6/134688193/a557e3.pdf
    • http://servisvds.ru/tamil_to_english_translation_downloadp11jv.pdf
    • http://dutarotanazosuv.medianewsonline.com/8795522050.pdf
    • http://onlinesos.tech/lezavolagukwrxt.pdf
    • http://zugemenelil.medianewsonline.com/math_word_search_3rd_grade.pdf
    • http://rejawulomov.mywebcommunity.org/wofexukopisurif.pdf
    • http://lojasamericanasbr.com/photoshop_for_dummies_youtubed9klj.pdf
    • http://budokudepa.scienceontheweb.net/16496806922.pdf
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/0be5f1c14ee7a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tulazonakem.epizy.com/bexexelufodivekamiwu.pdf
    • http://rilerulijomowam.rf.gd/cessna_421_golden_eagle_performance.pdf
    • http://sewerufuzamo.rf.gd/pafamilenutanufexolinaki.pdf
    • http://lumosaneja.onlinewebshop.net/a_level_chemistry_revision_notes_ocr.pdf
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_197cb1d094884fc3951b3db96a265209.pdf?index=true
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_4e1f8064345a4d3abfab9851b916e55a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d164.bin
7d685b44504d937136f023ab1b7408be2b680d6df4b6057b70da518b6872bf1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD164 4992 bytes
font_01_sfnt_off0000e26b.bin
c55e6eb86d5822a8ca55a7e90685413af1a98ca0f30fe659c80d572a99694e39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10368 bytes

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