Malicious PDF — malware analysis report

Static analysis result for SHA-256 d767bce3be6bfd98…

MALICIOUS

PDF

96.2 KB Created: 2021-03-19 12:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27323afd85f02f56c79adaaadd34c7ca SHA-1: 57729e6068c95a3f584df43391e3093cad42a794 SHA-256: d767bce3be6bfd983fc1e0a7e7d7593dfdc8425f8a5105639bac7e6f5044650f
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that points to a suspicious domain, likely intended to host a phishing page or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, suggests a lure related to 'chapter assessment answers'. No scripts were extracted, but the presence of an external URI in a malicious PDF is a common tactic for delivering secondary payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wix?keyword=chapter+assessment+examen+del+capitulo+4a+answers
    • https://cdn.sqhk.co/vagekoxes/7jduhaK/rakolubaruzipozowesomig.pdf
    • http://janipuwibir.mywebcommunity.org/18397073393.pdf
    • http://jasazotinalol.mygamesonline.org/52327014132.pdf
    • http://dinusedixiwog.iblogger.org/docker_community_windows.pdf
    • http://purubifo.medianewsonline.com/rujesijitikep.pdf
    • http://dosijaruwiteli.mywebcommunity.org/belief_definition.pdf
    • https://cdn.sqhk.co/zevivovakok/gOshce7/buyers_guide_waupaca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3bc3ec2d-a896-4e2d-8667-1ac54d19437f/how_to_open_digital_sentry_safe_without_key.pdf
    • https://uploads.strikinglycdn.com/files/9147e56e-220d-4976-aaeb-2bb3843d006c/gavotokazorokafuwaxutija.pdf
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_876a9af87efd437281a95fd5eb03fd8f.pdf?index=true
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_6f6032fe956c4a838e432d26e1159d9d.pdf?index=true
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_4514a2f3119d4e48bdeb2ba5243fd415.pdf?index=true
    • http://gesesasogibigaw.rf.gd/dicionario_portugues_para_espanhol_online.pdf
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_a9d2929ef67841f68a4a6c1f5078805f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9fdc89c2-f211-4ad9-8ea5-33f1ea61bb9c/what_does_the_constitution_say_about_electoral_college_votes.pdf
    • http://wumugajus.onlinewebshop.net/dyson_dc41_troubleshooting_no_suction.pdf
    • https://uploads.strikinglycdn.com/files/45787549-6111-47aa-b5a3-a6dcc76d1344/arturia_microbrute_used.pdf
    • http://giworutiw.myartsonline.com/employment_news_paper_tamil_this_week.pdf
    • http://jasunusemoki.onlinewebshop.net/32766281211.pdf
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_88b427f5150f481cbe78bb69719cd783.pdf?index=true
    • http://femixuduj.rf.gd/odia_film_bhajan.pdf
    • https://uploads.strikinglycdn.com/files/1a68de1b-bf48-4d6b-9063-4a3700d8e501/lowrance_elite_4_chirp_installation_manual.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_off0001353c.bin
3ded674a74edfa0c51b6468e056ed7495f5efba62abc2a6d8767f2d3269a6580		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1353C 5464 bytes
font_01_sfnt_off000147ba.bin
fccaf97d2b1506054d8d7b97bba880ee6263dcf7a9ece033db03f37caa73acbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147BA 12796 bytes

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