Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc04a0a2e978544…

MALICIOUS

PDF

103.2 KB Created: 2021-03-03 17:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7273fa4884ee0f68143a0e57dc90b25a SHA-1: 4e7dcec9a244bd65f49b4d12b6e2add56d439d71 SHA-256: efc04a0a2e978544c95ab3c39424c213eb81fa970565bf27ba24c9462933c8cf
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be related to installation instructions, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/123?utm_term=dura+ace+di2+9150+installation PDF link annotation
    • http://lorebip.22web.org/57675166816.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505326/normal_5ffda3217f812.pdfIn PDF document text
    • https://cdn.sqhk.co/votiwixuduzo/Meuiigi/smart_goals_examples_for_students_gym.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelofid/ib0VjeF/color_lab_covid_san_rafael.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokonabat/hbaqhOv/11000750236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497395/normal_5fcfa7fc480f4.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/geJjegj/sniper_shooter_3d_fps_assassin_gun_shooting_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424996/normal_5fd0877d66549.pdfIn PDF document text
    • http://vupiziriwopo.22web.org/house_on_mango_street_study_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jepogedepujadul.rf.gd/37113771316.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/jibafewomesaxejama.pdfIn PDF document text
    • http://tokejavopif.rf.gd/44634987273.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/pilafibafavilorikajupabo.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_off0001564f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564F 5536 bytes
SHA-256: 6a3cc8e74b9eb21ed8c868e272b292f40bfdefb6c549dc90640ee55b09224735
font_01_sfnt_off00016933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16933 11428 bytes
SHA-256: 7ef16531541b5bd422e761294df2e3a4e43c4cb0758b88cdf8a805b36627c8d1

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