Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e73bac50544118…

MALICIOUS

PDF

73.5 KB Created: 2021-02-18 01:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 464c8fb026daa8b6252f890e5e8cffd4 SHA-1: 3ce415c8d5b00c8dd3948c5953ff7777ee4fb6c1 SHA-256: 20e73bac505441182e9ff0050782f8f2a010125cb833dddc8361468381e2278d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or malware distribution, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=barnes+and+noble+track+order PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413113/normal_5fc8fc4987bcc.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/bopepejaraka.pdfIn PDF document text
    • https://fobizolavavoka.weebly.com/uploads/1/3/1/4/131406440/6e19ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421039/normal_5ff685c0b311a.pdfIn PDF document text
    • https://rovepegolotiru.weebly.com/uploads/1/3/4/3/134319415/kirov.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/ajghfFY/48383546946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5fe8b4e722168.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/gHJxhfc/pool_games_free_download_for_android_mobile.pdfIn PDF document text
    • https://mipupupomekux.weebly.com/uploads/1/3/2/7/132712043/selapemanawadedakup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vutame/board_of_directors_meeting_powerpoint_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/barton_college_practice_placement_test_math_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/tupobosiruvanife.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/agnaten_se_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/32841700461.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/cisco_3750_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/kojubajodafuburo.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/biwenirelebimemukibom.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/global_competitiveness_report_2016.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 5188 bytes
SHA-256: 9a67689657fbb2b5b10d7623db86b192b896d520f668c64001c79383d17e2434
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10888 bytes
SHA-256: 3396b9c6ea3356df3a59f07d78bf4fc0102ecbd2fae02be09c79992bfe8feac1

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