Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9617249956a186e…

MALICIOUS

PDF

80.6 KB Created: 2020-12-18 03:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 880bb24f6a1a74d0dcd643c2724c8c04 SHA-1: 9ada9113797aa05c643430b4404e1203d31b775b SHA-256: d9617249956a186ed94bdab9a92922fd2f1886dee5ee8900bfe172fe681ade56
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it's a phishing or trojan delivery attempt. While no scripts were explicitly extracted, the nature of the redirector links and the overall detection suggest an attempt to download and execute a second-stage payload.

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
  • 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://gettraff.ru/aws?utm_term=arthur+conan+doyle+sherlock+holmes+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5fd8e6fbec859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f87194822e65.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/5a0dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5fa0ee4583eb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5f9204351c039.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/famexuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5fa197a776f64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fcf43d3a3719f737323d3f8/t/5fd64c55ab777271768bc6e0/1607879768382/spring_constant_lab_report_discussion.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6cf121a9b7f6479338f83/t/5fcfa1de7c36362741b7e16f/1607442910250/second_hand_clothes_wholesale_uk_manchester.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ad6897-51e0-4234-82bd-065fe40ff27e/98161398825.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5aa04e98326c0207dbf8/1606376101914/art_as_technique_by_viktor_shklovsky_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/81565752401.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc35e67cd1e280355e3f728/t/5fc52e9c9ee0f32b87fb17a4/1606758046516/nfl_pool_sheet_week_11.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5cf0117e72026400bb701/t/5fc6c761b2fa4660c8be9d64/1606862695541/merufatadalo.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_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 5552 bytes
SHA-256: ccf1bffbeae6cf093f4280a2d93b77939f8139e7556574db99cecef8c6c2bfa9
font_01_sfnt_off00011126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11126 10612 bytes
SHA-256: 0fa50335437fb69d40a3957691b90c4f515024203c9e9786f4a0ad8714731d97

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