Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc5c006a04bea4a…

MALICIOUS

PDF

75.2 KB Created: 2021-03-28 05:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cf223b2ed255048e0af9f058380e5d8 SHA-1: be7afe6f2753e58c447964953a9193cef68b7755 SHA-256: 3bc5c006a04bea4ac4c67c41710db5e5e39468b5dd0533270dbf5ab0fe150530
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', aligning with a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=eres+tu+maria+worksheet+answers
    • http://app-3null.com/what_did_they_use_to_play_basketball_in_18912q61y.pdf
    • http://fakurivevid.scienceontheweb.net/examen_bacterioscopico.pdf
    • https://cdn.sqhk.co/bomumuxa/ihghUo4/jokajinewuvare.pdf
    • http://jomikifu.medianewsonline.com/cadena_de_suministro_lean.pdf
    • http://ourfanz.com/cdc_guidelines_for_gonorrheakb39b.pdf
    • https://cdn.sqhk.co/govonesed/3hhyXxa/dungeon_survivor_2_guide.pdf
    • http://parkji5x.xyz/187538341759san.pdf
    • http://zedateve.mypressonline.com/24684820597.pdf
    • https://cdn.sqhk.co/dugixikisim/hDiesGL/ebl_smart_charger_user_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e8187658-3d56-4512-9ef2-366b23efe5e4/fanuc_series_18i-tb_operator_manual.pdf
    • https://uploads.strikinglycdn.com/files/2b121178-7160-4894-8187-8349159278f5/manual_de_supervivencia_urbana_fernando_aguirre.pdf
    • http://naburonip.myartsonline.com/medical_terminology_for_dummies_free.pdf
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_e41f304b962a4244bcd26096550f04b1.pdf?index=true
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_594645a1f98e4514b00d5867a0d23c50.pdf?index=true
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_8857163a3fa944a180978d7f0c093227.pdf?index=true
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_80470c06f71440c7bd658a86cf063da9.pdf?index=true
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_54418afbb84c44be9edbd52293b73b08.pdf?index=true
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_b2a93ffea6d543e18e26e7b3a387d747.pdf?index=true
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_cdb1e921ac3e48da814d0d666ee987c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c575b16d-8b8e-44c9-a858-30fdab360a77/how_many_gpm_does_a_1.5_hp_pump.pdf
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_589e31115ee949f191a8146ca5c6fd83.pdf?index=true
    • http://rulamiji.onlinewebshop.net/gudaze.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_off0000e55b.bin
174089f5a00417692e716c36b71ccbc16a857bf7864ea4f76ad4b1cedd3660e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 5004 bytes
font_01_sfnt_off0000f645.bin
8c8e8c60d623a7606e1eaa1923c38006cd2d275ef271423d081358d79acc53ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 12192 bytes

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