Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b587197b4ab13fa…

MALICIOUS

PDF

87.5 KB Created: 2021-04-01 09:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4264b942c560c0206016d4ea67399cf SHA-1: 58a725aafb08bcc72c479dd8ff5b73e44e075b67 SHA-256: 8b587197b4ab13fad6057795e7f174d4390a4369a51dda3578b5fb60f9736b64
96 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, containing an embedded URI that points to a suspicious domain. The document body, though heavily obfuscated, suggests a lure related to academic exercises, likely intended to trick users into visiting the malicious URL. No scripts were extracted, but the presence of an external URI strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=exercicios+angulos+inscritos+na+circunferencia+pdf
    • http://bapitosegapegi.mywebcommunity.org/percakapan_bahasa_arab_amiyah.pdf
    • https://static.s123-cdn-static.com/uploads/4385424/normal_6008cc528c4de.pdf
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5feb80ac6e03f.pdf
    • http://sutezesibopixiv.medianewsonline.com/auxiliary_verb_do_exercises.pdf
    • http://ramedefinu.getenjoyment.net/60774855971.pdf
    • http://rejorevubirobu.sportsontheweb.net/sibukuvolavenowufonetis.pdf
    • https://cdn-cms.f-static.net/uploads/4444115/normal_6022ea9f849c4.pdf
    • https://cdn-cms.f-static.net/uploads/4368469/normal_603130ea8a651.pdf
    • https://static.s123-cdn-static.com/uploads/4418001/normal_5fc61ac0cbaac.pdf
    • http://winoxolupuvil.getenjoyment.net/97740143813.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fazatela.myartsonline.com/61291071329.pdf
    • https://uploads.strikinglycdn.com/files/463a737c-3bf5-45d0-ba00-4727f2d480b5/best_non_c_wire_thermostat.pdf
    • https://uploads.strikinglycdn.com/files/d22ac8a8-9b60-4388-98d5-7f9a8bacda47/the_twilight_saga_eclipse_part_3_full_movie_in_hindi_download_720p.pdf
    • http://ziwivazud.onlinewebshop.net/electrical_engineering_design_software_free_download.pdf
    • https://uploads.strikinglycdn.com/files/7fc6f942-0082-4594-ad30-eda65c715a58/rulugiwipebola.pdf
    • https://uploads.strikinglycdn.com/files/f921f1b1-b0ae-4c9a-89fd-640a1283a57b/10804844152.pdf
    • https://s3.amazonaws.com/vabemavuputenif/how_to_use_casio_fx-9750gii_for_finance.pdf
    • http://seroroxunabolu.onlinewebshop.net/megusolove.pdf
    • https://uploads.strikinglycdn.com/files/59041aee-1e62-45bb-a0ec-59168913ec1f/46440314921.pdf
    • http://weparaxopulo.atwebpages.com/jiradasazizox.pdf
    • https://s3.amazonaws.com/kiguteperilodu/bard_s_tale_mod_apk_data.pdf
    • https://s3.amazonaws.com/satuja/20113401766.pdf
    • http://majezomisi.myartsonline.com/31643451571.pdf
    • https://s3.amazonaws.com/tisegovofu/honda_rebel_300_vs_500_size.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103d6.bin
e34663c14e7538c59c7f8121cab552d8cd5cad3e9b88337b32e17b20e9ff7c1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 5228 bytes
font_01_sfnt_off000115b2.bin
648b29457a5fdda64e3791ad6880fbee1c7b1b3c24fb1b7378cf153c4fc353b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 14624 bytes
font_02_sfnt_off00014221.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14221 4324 bytes

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