Malicious PDF — malware analysis report

Static analysis result for SHA-256 a344d42d4f4738c3…

MALICIOUS

PDF

75.4 KB Created: 2021-03-20 00:28:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f110234bda2a8f22c6c3140360c436ad SHA-1: 790a830bd0c726a650379c05324030d7682c2a36 SHA-256: a344d42d4f4738c310675dba78b5828f2b5beda41de921b0b7a583f8437bbce0
104 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The document body, though heavily obfuscated, contains text related to an invoice or payment lure, supported by the SE_INVOICE_LURE heuristic. The embedded URL https://jacksth.ru/wix?keyword=jesus+didn%2527t+tap+t+shirt is the most prominent IOC, likely serving as the initial point of contact for the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jacksth.ru/wix?keyword=jesus+didn%2527t+tap+t+shirt
    • http://sogejovep.mypressonline.com/nafewuzodetonowa.pdf
    • http://sopisafexuj.sportsontheweb.net/casey_at_the_bat.pdf
    • https://cdn-cms.f-static.net/uploads/4479707/normal_6022d754a3b02.pdf
    • https://static.s123-cdn-static.com/uploads/4452148/normal_5ffc97f1c4724.pdf
    • https://cdn-cms.f-static.net/uploads/4370066/normal_601992c3d99d2.pdf
    • https://static.s123-cdn-static.com/uploads/4472783/normal_5fc673e4c4efb.pdf
    • https://cdn-cms.f-static.net/uploads/4427313/normal_604e44c1ed7dd.pdf
    • https://cdn-cms.f-static.net/uploads/4472793/normal_6025defa0910b.pdf
    • https://static.s123-cdn-static.com/uploads/4410207/normal_5ff7dfaab07e3.pdf
    • https://cdn-cms.f-static.net/uploads/4464878/normal_602a2c908e53f.pdf
    • http://nemugub.mywebcommunity.org/beginner_bodybuilder_diet.pdf
    • https://cdn-cms.f-static.net/uploads/4417327/normal_600de7773b18d.pdf
    • http://lomikoju.22web.org/average_logo_design_cost_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gujutavevive/google_cloud_admin_guide.pdf
    • https://s3.amazonaws.com/senodiw/16324468887.pdf
    • https://uploads.strikinglycdn.com/files/39977b8c-f33f-490e-af8f-0da690fede9c/vaxiridilofebevegekuvepu.pdf
    • https://uploads.strikinglycdn.com/files/6d3d900b-0e3b-406b-8544-a314feefbe8d/jujagi.pdf
    • https://uploads.strikinglycdn.com/files/c1b52572-736c-4f11-8509-5ec7416b7675/waniperabipipefe.pdf
    • http://rorodev.rf.gd/82018119242.pdf
    • http://tirupujox.epizy.com/63170100373.pdf
    • http://vibudunudetot.rf.gd/66172090752.pdf
    • https://uploads.strikinglycdn.com/files/29fbeeb8-0869-423e-a38a-4011a7d2363d/how_to_deal_with_poor_listening_skills.pdf
    • https://uploads.strikinglycdn.com/files/3534949a-dfc2-41e7-bee6-1e169522bc17/ramurekawej.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_off0000e8d9.bin
0abc758eaee30acf618ebe65fea9e6b4bb877facfadb3198422c6a73636707df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 5036 bytes
font_01_sfnt_off0000f9f7.bin
6e71cdcc219c89b24f11bf661e1aff390ea3c0358eb826e7ad1107853a25bf0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 11640 bytes

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