Malicious PDF — malware analysis report

Static analysis result for SHA-256 8453cd5d051e9e53…

MALICIOUS

PDF

76.5 KB Created: 2021-03-10 09:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b94c7b2920c1542290b1bec7b229314e SHA-1: 2e646ca94b6dde162b91f969d65e0bfd6591509d SHA-256: 8453cd5d051e9e53a8d98059ca0e111f8d882f8a3ba733c1842df9a0fd8056f9
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/aws?utm_term=ng-book+the+complete+book+on+angular+9+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/tusadopovet/jhaYrWE/fashion_all_star_jersey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453144/normal_5ff1bd3adf3dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_600a417255436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_603e3c5672c24.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/59iewjj/junezutijeninodanakuxukiz.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/wSz4aii/bixolegiwufopitasur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_600a0f8262c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_602ca1a93e2bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375210/normal_5ff71519c1467.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/iiihgiY/license_plate_game_checklist_printable.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/kawotexulozax/57399915368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae70f4c7-767c-4338-9776-acbfb9760f13/sat_test_prep_math_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae854fe-4b92-4d8c-9e18-05ba10a09421/radio_shack_scanner_programming_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b29c42-9440-426d-8e4c-ac57d2146b72/womuzosewisazizopifonul.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/gimikuwikefidakuxarus.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/novexel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a748eb-4c7e-4f1f-a8f1-9aa31556e2e6/5th_grade_essay_example.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/baofeng_uv_5r_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/audacity._sourceforge._net_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/7624810923.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/34982269165.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_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 5844 bytes
SHA-256: 57df02aa41ec1ee458dcf959dfa956a043607b5de2bedb6919586f96f84d7fc7
font_01_sfnt_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 11416 bytes
SHA-256: a607b3299abf740bc7e5a4a24aa3816807e4e03885d2b4eef87596f7a90186f0

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