Malicious PDF — malware analysis report

Static analysis result for SHA-256 c645f6448f991404…

MALICIOUS

PDF

78.1 KB Created: 2021-04-05 11:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb99e90cb7159decb1d895228f4732c4 SHA-1: d0da83832e05b0bcf888a55be19ee7c2a1aa7526 SHA-256: c645f6448f9914046534f0d868d76f4c3b6ebca38aaff8e7206d06d01535514d
136 Risk Score

Malware Insights

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

The file is a PDF that contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'punctuation practice worksheets', indicating a phishing attempt. The presence of external URIs and the overall detection profile suggest it's designed to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://xezojetit.ru/123?utm_term=punctuation+practice+worksheets
    • http://vanlit.ru/56315069602i6w38.pdf
    • http://servicesforsupport.com/62689517334fe25m.pdf
    • http://zitokujamu.mypressonline.com/international_tax_law_courses_online.pdf
    • http://suraneb.scienceontheweb.net/lusajibexi.pdf
    • https://cdn.sqhk.co/razotefo/WjcKiia/top_100_resort_golf_courses_in_the_us.pdf
    • https://cdn.sqhk.co/litopozuf/jge4Gic/switch_controller_adapter_xbox_360.pdf
    • http://wekanisa.scienceontheweb.net/88365158847.pdf
    • http://salea.site/favunoxakuxokupoxaxuzxoij.pdf
    • http://vkysnaya-eda.site/arabic_calligraphy_classes_melbournetb9at.pdf
    • http://tradestaroffice.com/mabikuxeduqycvx.pdf
    • http://legegapepapo.medianewsonline.com/58028913923.pdf
    • http://alsamcctv.com/barbie_movies_in_tamilbnkyc.pdf
    • http://static-start.top/how_to_do_a_finger_wave_curl3n946.pdf
    • http://sevezor.scienceontheweb.net/63453147292.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/46893142-dca9-4666-9a16-ef6923331333/23844619399.pdf
    • https://uploads.strikinglycdn.com/files/31438082-7f9a-42d3-acbb-210eef9a6db7/jajufodujo.pdf
    • http://sisufovofow.atwebpages.com/30678917314.pdf
    • https://uploads.strikinglycdn.com/files/f459e9ed-df61-4948-bc2f-26fbf77ccd9f/what_is_the_healthiest_frozen_dinner_on_the_market.pdf
    • http://satawakerexe.atwebpages.com/nikezibevivodadasudovotif.pdf
    • http://gumusimigogasuz.onlinewebshop.net/78138858587.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_off0000f24f.bin
6832f8ace2d755345164121872587a19acf201de1f10de857d850963f4a83403		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 5148 bytes
font_01_sfnt_off000103e1.bin
5676078eea0ac404bb2bc76bede19bb0b6a648a22ad75996af566980fca56985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 10916 bytes

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