Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcbd7d770933db1…

MALICIOUS

PDF

63.0 KB Created: 2020-12-01 01:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 02ecf61767ff38aa86362b0901b0fa6f SHA-1: 15a54fc740252cd2695c3a2ad006595c0d7099d7 SHA-256: cbcbd7d770933db19b083f314d926b0baafef616c5b45fcaedf6735ecca7b7a2
154 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://gettraff.ru/strik?utm_term=what+is+a+constant+of+proportionality+kid+definition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4494875/normal_5faf2ca1b1dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_5fba5f3a550c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_5f8f833ba95ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f8701afde278.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/756c4ab1-bf01-4714-8309-3769ab2b4605/every_grain_of_rice.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc01ccfc14dfd36feed28e9/t/5fc3b7503c6ccf69f3cfdf56/1606661968970/unblocked_games_69420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf8a43a-50c4-4fad-a56c-5c39d81595d3/exercicios_geradores_e_receptores_pd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf618483-0b24-4b1d-a0c0-87e7e21ecf29/79128399573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a453d89e-b097-4b2a-b551-1c0242756a37/16953722720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2fdd8af-a0a2-453d-9eaf-710a80035caf/home_theater_subwoofer_amplifier_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11a532e-d8c8-47b1-aedf-f0c1ea9160bd/pioneer_games_lds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1ed520-c55d-4dcc-ad2e-a75a555fe954/22814367339.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_off0000b5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D8 5420 bytes
SHA-256: 7bf04ed32a088167c12aa22157f13f102737dd81af616399855a9edd2977fd5a
font_01_sfnt_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 11488 bytes
SHA-256: 61c005bce66f4b845bcc7b7e416f0b6f0926587c85cecfbcc5940b3a12b73cfa

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