Malicious PDF — malware analysis report

Static analysis result for SHA-256 7495a45111322d3d…

MALICIOUS

PDF

72.8 KB Created: 2020-12-19 22:39:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b8642bbbb7e29f757c10d332ee49edfe SHA-1: 94d3c55fd4973acb89df0461cb9181f774fa8ccd SHA-256: 7495a45111322d3df1b403db1d0e3e7e08e5e3ec1677bf84a4cd250263e0c4e7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Washington sick leave law 2020'. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • 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://ggtraff.ru/123?utm_term=washington+sick+leave+law+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_5f9fae57d05dc.pdfIn PDF document text
    • https://gumarifubora.weebly.com/uploads/1/3/4/4/134465571/615e6d6dcbe9a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476147/normal_5faab6231bd67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5fd8262d3d278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f87d3716efb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465687/normal_5fbc69b2336c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444869/normal_5fa0407e7c3d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_5fc14ce6d66a0.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/lovetijif/hydraulic_jump_report_discussion.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/40938685359.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/tazabugunatomofunulejinu.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/voruresagipi.pdfIn PDF document text
    • https://s3.amazonaws.com/damevusom/windows_media_center_will_not_update_guide.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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 5468 bytes
SHA-256: 5f3daac0c1c0ebd55cf5ff3365c396bbab86a00ea1c67073d21185989c6165cd
font_01_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 10408 bytes
SHA-256: b38bd47ea2a4a660b38fd9efdc6c91ac57a72a9d8aaa18200c20fc8dae46cc2b

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