Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab15ca94d631d41…

MALICIOUS

PDF

77.6 KB Created: 2021-03-19 12:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fddc4fe24eb27254d19df8b12ef3a65 SHA-1: dc55f006a8ddf6d295c520db9d5726608996c72f SHA-256: 0ab15ca94d631d41e08ce9146702fd4dccd17102e52dc7bb9e20d2e4acda7b6a
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains multiple embedded URLs, one of which is associated with a phishing lure related to 'grammar practice worksheets'. The PDF structure also indicates potential manipulation through duplicate object bodies. While no scripts were explicitly extracted, the presence of external URLs suggests an attempt to download further malicious content or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/123?utm_term=grammar+practice+worksheets+high+school+pdf
    • http://ig-copyrightviolation.com/android_studio_install_ndk_manually0lfab.pdf
    • http://poopo.ru/how_many_calories_in_veggie_power_bowl_taco_bellap0uv.pdf
    • http://mmmmmme.space/how_to_use_12_day_advent_calendarqsniq.pdf
    • http://lorezagosuvese.scienceontheweb.net/analytical_method_validation_ich_guidelines.pdf
    • http://mylic.ru/autocad_lt_2010_windows_10gw6q9.pdf
    • http://xonejalevesezom.sportsontheweb.net/energia_eolica_ventajas_y_desventajas.pdf
    • http://freedate18.xyz/zulibalekf8gl7.pdf
    • http://workbykoder.xyz/266665810112d5zh.pdf
    • http://sawemawe.mywebcommunity.org/why_is_my_honeywell_thermostat_blinking_leave.pdf
    • http://sekelenogake.getenjoyment.net/diaphragmatic_breathing_benefits.pdf
    • http://witikotuxigere.scienceontheweb.net/71404295922.pdf
    • http://tewatag.medianewsonline.com/losinigivarawiliba.pdf
    • http://retys.space/mijimonaluzosenowukopjrnst.pdf
    • http://kismykeitio.best/baby_girl_outfit_for_weddinga466s.pdf
    • http://gadatoreneperil.mygamesonline.org/medegilarejelesebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xapamafoxufovig.epizy.com/plan_center_parcs_lac_d_ailette.pdf
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_ebd346b1dbd34642969a3fe609896109.pdf?index=true
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_e147aa39f142416aa72086c26933e21d.pdf?index=true
    • http://vijekidifo.epizy.com/gajavokujage.pdf
    • http://kobuxotaregudes.rf.gd/monarch_master_water_softener_installation_manual.pdf
    • http://firixafuzive.rf.gd/ponatisijilotuzabo.pdf
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_90ea7e122d684e09b173dea9cb25f1b7.pdf?index=true
    • http://kedixiravupit.epizy.com/neperikonak.pdf
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_defdd2f349e4463cbe147ef8f86d9e68.pdf?index=true
    • 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_off0000efe4.bin
b9e0d27a6049953e9295f98fc630575f3efb76624125b373d3138392f420c4f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 5756 bytes
font_01_sfnt_off00010364.bin
24d33f7fc1e10e6dc4e571075e5aab0fe03ffbf92b9dd4b090372190c697bcea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 10948 bytes

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