Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eefaa352e437fda…

MALICIOUS

PDF

86.3 KB Created: 2021-04-08 07:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 19c04bed6f2182f6d3a0d5d1fe95227f SHA-1: 6f14fbfbe088753e366750cf2b9b117bb69fd3f6 SHA-256: 3eefaa352e437fda5fe2d5a71d8a9ec255b73e9e1f813fcad10977fe180d234f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF document detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that likely leads to the download of a secondary malicious payload. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing and malware distribution.

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://jottigo.ru/wix?keyword=meiosis+worksheet+answers+fill+in+the+blank PDF link annotation
    • https://cdn.sqhk.co/gonolesuzam/HKjbNii/ios_messages_icon_black_and_white.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/66291046424.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/f5gihjb/beast_quest_switch_ign.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5fe992a13aede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449627/normal_5ff75e640dce9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_605dc3c93fbff.pdfIn PDF document text
    • http://pornbustyvids.com/29455463087trsnp.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/iKI7jb0/super_ninja_nickelodeon.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/dfhgjhq/new_bollywood_songs_collection_zip_file_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/idifggw/uc_browser_vpn_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5feda4219364c.pdfIn PDF document text
    • http://opros.xyz/how_do_i_restore_my_samsung_to_factory_settingsqt10o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fajetufekejo/no_fodmaps_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/main_clauses_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/73448933169.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/dragon_quest_5_ds_monster_recruiting_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 4944 bytes
SHA-256: b3b8cd569296504f0c206b35a862efd535698cfb8913155e7e25fa62095c0404
font_01_sfnt_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 14420 bytes
SHA-256: 028b7a3e17736c528362980e1cb9b1d556921f43fb34cbc0b3ab77588143873c
font_02_sfnt_off000127c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C6 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off00013cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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