Malicious PDF — malware analysis report

Static analysis result for SHA-256 545a01d14c6b1cc4…

MALICIOUS

PDF

82.1 KB Created: 2021-03-02 19:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2dc7aabf376a0a22b6fa4c71210738de SHA-1: b5f76cd1e38bc02548527ab0dbca4b9d7ae64c29 SHA-256: 545a01d14c6b1cc4dc3c69e4803f66e0f30247388ab41914ecc13d7c808c32bb
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. The document body, though heavily obfuscated, suggests a lure related to educational materials. The primary heuristic firing indicates an external URI, and ClamAV detection confirms its malicious nature, classifying it as a phishing trojan. The embedded URL is the most critical IOC.

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://midufefew.ru/wix?keyword=saxon+math+written+practice+answer+sheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486190/normal_5fe0e03920f59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448535/normal_600203b1569d8.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/ieihqhb/zivugiwonemovefeki.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/55511344586.pdfIn PDF document text
    • https://cdn.sqhk.co/fazofasufiwu/jgab5yy/xusonufagisatuxufetuwez.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/P4ihsaP/todoraremibikogef.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/giidgif/62013301972.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/85191227329.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/aq3oQih/slice_factory_pilsen_chicago_il.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491151/normal_5fcee2eb39334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407998/normal_600c4ff34341f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_6037e884a4ba8.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/hhgeMjh/vr_escape_game_lyon.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/an_assembly_made_up_of_the_first_second_and_third_estates.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/fowikorejodi/40813188933.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/ratobav.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_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 5404 bytes
SHA-256: 1a27fc54ff8be1f32d1e6ba54b338ead399a0cbd5c5a2bc5ed040f959d7c11f8
font_01_sfnt_off00011486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 10840 bytes
SHA-256: d965ecc0263d785a8921c78ffbf2902315ddff2b7b112455f2e011cba4c74f36