Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad66e5fed002cad4…

MALICIOUS

PDF

103.0 KB Created: 2021-03-01 07:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f58bccad82fb3a599e940d6c30927e1 SHA-1: 7b896555ea9bd56bd066fdbd27e96b946abb7a76 SHA-256: ad66e5fed002cad43976a1cc9f16a11f808d4315219336c5ac06770d7d892d28
96 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to 'binomial theorem biology definition' and the wkhtmltopdf application, suggesting a lure. An external URI pointing to 'seumenha.ru' was extracted, likely serving as the malicious payload or phishing destination.

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://seumenha.ru/aws?utm_term=binomial+theorem+biology+definition
    • http://dumubemajizukov.medianewsonline.com/sat_practice_test_7_answer_sheet.pdf
    • http://pazujiz.mygamesonline.org/63642060817.pdf
    • http://artistichomesolutions.com/pdf_editor_sourceforge_windows8osym.pdf
    • http://xafopawiki.medianewsonline.com/tifemaju.pdf
    • http://baby-slings.ru/88135390053wfcau.pdf
    • http://mudixefibewab.mywebcommunity.org/nespresso_use_own_coffee.pdf
    • http://ukranews.icu/30182454183gm305.pdf
    • https://cdn.sqhk.co/niririga/hiibRID/mafizobuwub.pdf
    • https://cdn.sqhk.co/xivijela/e9gjjc2/zabaxepafaserufebup.pdf
    • https://cdn.sqhk.co/mokabawimav/ijdn2uD/pba_pro_bowling_gameplay.pdf
    • https://cdn-cms.f-static.net/uploads/4369766/normal_602ebfa1d7672.pdf
    • http://kujunat.medianewsonline.com/99631936859.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gazijewevan/15900574870.pdf
    • http://nununad.myartsonline.com/fomirujeb.pdf
    • https://s3.amazonaws.com/sojebelevenex/16315330006.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/simple_compound_and_complex_sentences_exercises_with_answers_for_class_7.pdf
    • https://s3.amazonaws.com/pisik/60037395267.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001393d.bin
5a4514104d6bd2aaa1dcf979d0205dfb4e4ea5a3d57a964432677649cf67c443
pdf-font-stream PDF embedded font (sfnt) at offset 0x1393D 5436 bytes
font_01_sfnt_off00014b91.bin
993a498ea5fa8a6085d05cc41b45f9d04092f9c62f2b03552aeb32d141f1c092
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B91 13764 bytes
font_02_sfnt_off00017815.bin
7437f1d3c3c5ecd9ef7248a742a331031fcc245f65c2baf2ad7f8e2ce15b3025
pdf-font-stream PDF embedded font (sfnt) at offset 0x17815 16376 bytes