Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f772e17353e847…

MALICIOUS

PDF

72.0 KB Created: 2021-02-19 00:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1eb38d2ad4738b99fc6d886abee5794 SHA-1: 43905bda0c6eeda196725335e370f5b4a90ae6ad SHA-256: 58f772e17353e847e51b209caf4bc741ba87246bbc2786ba82811745e9889b8b
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to malicious websites, masquerading as an answer key. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish credentials or deliver further malware. Although no scripts were explicitly extracted, the presence of multiple suspicious URLs and the PDF's classification as a phishing trojan suggest it's designed to exploit users through deceptive content.

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://bologen.ru/wix?keyword=making+predictions+worksheet+1+answer+key
    • http://kumaboperituf.22web.org/58382389497.pdf
    • http://vivabozuna.iblogger.org/93942350942.pdf
    • http://3gusevshop.website/5716502468286ihr.pdf
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/373991.pdf
    • http://vetapako.22web.org/5360066986.pdf
    • https://cdn.sqhk.co/lijuwezasip/HEjdRhd/kotebejimowajuwipal.pdf
    • https://cdn.sqhk.co/rojarasam/Q6jggez/cartoon_video_tamil_sun_tv.pdf
    • http://mini-camera-super.club/vojeburejamunaxujezasof9u6t.pdf
    • http://ergors.space/70896567106x6zka.pdf
    • http://xawinagolagiju.iblogger.org/lutarusus.pdf
    • https://cdn.sqhk.co/nonuripot/gihijiQ/funny_tricky_riddles_with_answers_in_telugu.pdf
    • https://cdn.sqhk.co/mikedeto/icWjfjc/98775507064.pdf
    • https://waxukazo.weebly.com/uploads/1/3/1/0/131071095/vanogobab_ledagolufalus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nuvujudidasutem.rf.gd/blogger_store_template.pdf
    • https://s3.amazonaws.com/gidibesuxi/36938674505.pdf
    • http://davutawopoban.epizy.com/69585176899.pdf
    • https://s3.amazonaws.com/fajonubinomeder/bcmon_for_android_4._4._4.pdf
    • https://s3.amazonaws.com/genukopapovixo/belwood_lake_ice_fishing_report.pdf
    • http://vavijirodujozi.rf.gd/61211299476.pdf
    • 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_off0000dc4c.bin
3af5cd9291960d849e2e7ff7c55fa632cc83f60eff60b1f00026a7fc8cc28495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 5620 bytes
font_01_sfnt_off0000ef99.bin
f6d388ae2861a1b7294f1409837baa1dfaa35ad1a84c8cbaed1c0ab804e2ec81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 10176 bytes

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