Malicious PDF — malware analysis report

Static analysis result for SHA-256 338f9d6bb7c4cb7c…

MALICIOUS

PDF

82.4 KB Created: 2021-04-06 18:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 406af93fe3a11db3d0a14352f8ee78a4 SHA-1: e2f28556377cc45a1b15d2cfbbccf4736b885407 SHA-256: 338f9d6bb7c4cb7c6b7152cfbe43237c8ff8a8f3237833fafe963c9ec99b527c
136 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely contains instructions to decrypt a password-protected archive, a common tactic to evade gateway scanning. The embedded URLs point to suspicious domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bologen.ru/strik?utm_term=how+to+use+ribbon+for+gift+wrapping PDF link annotation
    • http://6gusevshop.website/how_to_find_my_hotspot_password_on_sony_xperiaxhdyp.pdfIn PDF document text
    • http://teren.fun/riforulejerumekepuvag0uts.pdfIn PDF document text
    • http://freshka.fun/wedding_march_piano_notespnssc.pdfIn PDF document text
    • http://sadovik.me/how_to_use_a_charcoal_water_smokertfvua.pdfIn PDF document text
    • https://zejosawazir.weebly.com/uploads/1/3/1/8/131856185/16c4d57e9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488807/normal_5ff341b216fe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483104/normal_5fd86b6c33456.pdfIn PDF document text
    • http://mosdendy.store/quadratic_functions_test_review_answers3fkim.pdfIn PDF document text
    • http://prizinsta365.online/bumetoxiweridemozitexutiqxj8l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470020/normal_6004cc5112c24.pdfIn PDF document text
    • http://kamaz-ftc.com/xuveputethnzvm.pdfIn PDF document text
    • http://citimart.online/gartner_orlando_symposium_agenda2u6ah.pdfIn PDF document text
    • http://meetplafond.xyz/90911420739hege2.pdfIn PDF document text
    • https://voloripilobolim.weebly.com/uploads/1/3/4/6/134635915/zosinujebupowevugowe.pdfIn PDF document text
    • https://jarurozo.weebly.com/uploads/1/3/5/3/135320013/958062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416301/normal_605618baa6129.pdfIn PDF document text
    • https://lexebovet.weebly.com/uploads/1/3/4/6/134628591/6746659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_6065182e80a30.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/metubevozisul/akeley_wood_junior_school_inspection_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/39921971610.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/ipcc_fourth_assessment_report_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/besejupeg.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/gorurubadib.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/sikotowidawuvonurugu.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/college_station_police_department_arrest_reports.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 5112 bytes
SHA-256: 7996752d50b1eb146a67ddc01662b50ff0cf6215c40fdaae942eddcafddb1a61
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 10764 bytes
SHA-256: 20ba523519c71ca3d56fc6beb6bb457cd2562e7c252b83c8b96508f70bf967f6
font_02_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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