Malicious PDF — malware analysis report

Static analysis result for SHA-256 93346afe42f802e6…

MALICIOUS

PDF

72.7 KB Created: 2021-02-28 09:37:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c8db50128f8cea891c52e3b778e19e78 SHA-1: 76d5df6ac87fc16c29f1a6382e5e12eb61ed44e2 SHA-256: 93346afe42f802e6dae11f25d0c51e35c563b333333e6ecf516786ddfc87c16b
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 a suspicious domain, mezovuduw.ru, which is presented as a search result for 'back to school supplies for 5th graders'. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

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://mezovuduw.ru/wix?keyword=back+to+school+supplies+for+5th+graders PDF link annotation
    • http://bidizujimon.getenjoyment.net/3_words_8_letters_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/bjdQgNL/58475635655.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/sedonuxo.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/intro_to_javascript_programming.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/how_to_stick_vinyl_to_a_cup.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/gewisetug/printf_date_format_bash.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/rofujenepivojunepuxajax.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/92642333702.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/wimopobemepakazazesokuduv.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/90976922507.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/corel_videostudio_2019_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/5555576330.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/maryland_circuit_court_answer_to_complaint.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_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 5656 bytes
SHA-256: ff50080d6a4199bb90a04af123496695399e82b24e2b9969290a1167416c8525
font_01_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 10840 bytes
SHA-256: 4b1310deee567cb53f309e9d0ca4c89a8d5f7bb66736ed4b02877d90133c2035

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