Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b3933c76b73210…

MALICIOUS

PDF

346.9 KB Created: 2021-03-29 23:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bac68b92f9b0bdfcdc146b0824f27a8 SHA-1: 7d854a2dce3c00f60ea053297a7964d6b6a031d0 SHA-256: 83b3933c76b73210cfa70a3bf4b0820e8db58257f5e77f210ba4b85982b240f4
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, which is likely intended to trick the user into clicking it. The document body, though heavily obfuscated, contains keywords related to salary information, suggesting a lure for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jumiwimov.ru/123?utm_term=chief+information+officer+salary+ireland
    • https://cdn-cms.f-static.net/uploads/4413850/normal_602b85ae5919b.pdf
    • https://cdn-cms.f-static.net/uploads/4451549/normal_603578076476e.pdf
    • http://xiwesesakuvel.medianewsonline.com/convertir_de_a_word_i_love_gratis.pdf
    • http://kazaxukiga.getenjoyment.net/agenda_21_global_resumo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://widepidaba.atwebpages.com/financial_ratio_analysis_case_study.pdf
    • http://lufapot.epizy.com/lexaki.pdf
    • http://nozabikuj.rf.gd/88074338214.pdf
    • https://uploads.strikinglycdn.com/files/f29a097c-20aa-4db5-ba04-ec2a3b51b2cf/what_does_non_clinical_significance_mean.pdf
    • http://nojikigor.myartsonline.com/69466253116.pdf
    • https://s3.amazonaws.com/jusagi/consent_to_receive_text_messages_template.pdf
    • https://s3.amazonaws.com/lizuseguwix/jikupoxotedixegikabuzoxu.pdf
    • https://uploads.strikinglycdn.com/files/ad70480b-39b2-45e5-b1db-bacec0d1b28b/justin_timberlake_cant_stop_the_feeling.pdf
    • https://uploads.strikinglycdn.com/files/ec089e5f-789b-4de8-9f55-8ba803f6b0ec/g_shock_rangeman_manual_receive.pdf
    • http://bufijonewufo.onlinewebshop.net/mukirolimipo.pdf
    • https://s3.amazonaws.com/davolazupivowi/kixokifutawuwiviwad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000515f7.bin
32a6077dfa9ffdb995bfc21ff165e6cd848056da89ff38276cd67ad875cc4e88
pdf-font-stream PDF embedded font (sfnt) at offset 0x515F7 5268 bytes
font_01_sfnt_off000527ae.bin
a3bc3f79710db5d9e25acfc03f428546e0b61a7e8bb953524da896db077a1682
pdf-font-stream PDF embedded font (sfnt) at offset 0x527AE 5304 bytes
font_02_sfnt_off00053656.bin
f01eb1c5d88869f5bedcdb0ce4b0c57046dc6e18f8a7cc5ec8b1dccc64bfd006
pdf-font-stream PDF embedded font (sfnt) at offset 0x53656 11592 bytes