Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66bb5331231fd2c…

MALICIOUS

PDF

69.3 KB Created: 2021-03-18 07:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 002eb3714fc8e4fde62da8ffacd99f79 SHA-1: 7ba6b5b53544fb369ae06635fb4d5a01b43a8acd SHA-256: f66bb5331231fd2c5d8bf9b3e3d1216f64ebdd3c1828d3d32e09b44638252e69
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains strings related to 'Twitter picture hd' and the authoring application, suggesting a lure to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=twitter+picture+hd
    • https://cdn.sqhk.co/femuzetoj/SmLpuIK/pinosijesojogelarexu.pdf
    • https://cdn.sqhk.co/wasefago/muIDiek/54249783520.pdf
    • https://cdn.sqhk.co/livukigelo/mjigeQ1/call_of_duty_warzone_download_for_android_free.pdf
    • http://sewiximafa.22web.org/competitor_analysis_matrix_template.pdf
    • http://sukotovomiregat.22web.org/autocad_mep_2020_user_guide.pdf
    • http://wizomokupelew.iblogger.org/mokuxito.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_ad765874e0d8426e97adc8ad8f1c04db.pdf?index=true
    • http://kenamumiv.rf.gd/incident_response_playbook_template.pdf
    • https://uploads.strikinglycdn.com/files/c39e62a7-d7c6-4318-87aa-d247abd71216/72612657206.pdf
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_c7ebd666da4541ecaa7cdd8e4f8e76a4.pdf?index=true
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_0dd2808c38d2491c89e1bccc97cbe108.pdf?index=true
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_99510483507543cfbb7c449c9d749df9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7741afe4-9bb8-4ed1-ad14-0e2cea6f4498/xamawarokabobes.pdf
    • https://s3.amazonaws.com/zidosozawok/vugix.pdf
    • http://veraliw.rf.gd/xabazerikitametimivur.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/cyclohexane_properties.pdf
    • https://s3.amazonaws.com/xalexojaxipud/harrisons_principles_of_internal_medicine_twentieth_edition_vol.1__vol.2.pdf
    • https://uploads.strikinglycdn.com/files/8969ff4e-e518-4d25-ae37-322c6220e884/35628652087.pdf
    • https://uploads.strikinglycdn.com/files/e6cf5588-0143-4191-ad1e-42417ca19212/xevexanavesovusasasagax.pdf
    • http://junimufik.epizy.com/calculating_discounts_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/3cd37aaf-9bc6-4ab0-a123-21c4b7b1d12d/stihl_fs_55_trimmer_reviews.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_off0000d3f8.bin
8639a7268d7acba969c4eae454910179d6274cfbf8edccb49aa5a987863a1530		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 4784 bytes
font_01_sfnt_off0000e447.bin
a0db4bdc9eedd772646e95cbb3de77d63a00000a242954974d3b8958517e7bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 10472 bytes

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