Malicious PDF — malware analysis report

Static analysis result for SHA-256 b274a86d0bdc5af7…

MALICIOUS

PDF

83.0 KB Created: 2021-02-14 02:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: da52e32e6c08c0522dafa085cf10aa1e SHA-1: 3f4b63dd74ce96dbfa93123b5d3947adb33077f2 SHA-256: b274a86d0bdc5af74b73e77ccd05cfb57c44a0c99e4e6020fae8f520c329cc73
96 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, likely intended to host a phishing page or download further malware. The document body, though heavily obfuscated, suggests a lure related to 'memory policy' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/wix?keyword=what+is+a+memory+policy PDF link annotation
    • https://cdn.sqhk.co/zevolazezag/GxibXWJ/flappy_dunk_icon.pdfIn PDF document text
    • http://reduslimitalia.site/lecture_ready_3_second_edition_answer_keyp00b1.pdfIn PDF document text
    • http://joy-todays.online/83152829414ug877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5fd913ee960f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368979/normal_5ff9f3d4a1e71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fe0b8e4e54d5.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/gcNkTgj/sevanagafinoratuvuvev.pdfIn PDF document text
    • http://idealicaitaly.site/gubuvivivuoz2eq.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/iQtC0he/ddpai_mola_n3_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496828/normal_600f154901433.pdfIn PDF document text
    • http://1cats.space/arduino_robotics_projects6xzpf.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/kavifunaruvi/kuborekejipapolezud.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/tricep_kickbacks_proper_form.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/robbery_bob_2_hack_version_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/indian_food_recipes_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/lovoninukelig.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/guide_bricoleur_dofus_1._29.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/kubap.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/enrolled_agent_study_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/mickey_ear_headband_template.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/ielts_liz_speaking_with_answers.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_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 5288 bytes
SHA-256: edf07075be1e0896a3c6dfd60c6497644b638343f14fd3612f8c30a922cf562c
font_01_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 10792 bytes
SHA-256: db9b37fb98469d33ed6ea005489c9161588fe097f8bf5d28d3884bd1b2b9b697

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