Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f3743eb40aca63…

MALICIOUS

PDF

68.9 KB Created: 2020-11-20 11:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 284b93547bf8ec4434ac9a2c15b190c5 SHA-1: 3bdc8e6dad0c357b210b17bcc22e635c413bd25a SHA-256: a0f3743eb40aca6302dcb37b9bd2ea313d5d37375b74ed4bfb17d0be535df78e
222 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool. The presence of numerous external PDF links indicates an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/123?utm_term=what+is+the+celestial+sphere%253F In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_5fb34b81806ae.pdfIn PDF document text
    • https://pazolumaf.weebly.com/uploads/1/3/4/3/134356568/1633805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5f89d85aa604d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417990/normal_5f99b8ade84a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5fa045b6112d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5f9bc7543c88e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_5fb0329416971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475738/normal_5fa55ca1d3671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_5f97a67e7ab54.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/zakunafu/template_to_keep_track_of_monthly_bills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ad6a73-73b6-4227-881f-b25cf5a44cdb/mogitawit.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_off0000cfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCA 5176 bytes
SHA-256: 9de928e3a07d53a00457a16d3a48134b7bd5ef5f528e01ca9255de5aebdde595
font_01_sfnt_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 11020 bytes
SHA-256: d8af2c97fc54bd7b1319102e6c816d9bcf5de54f7c3ab7e00de90bf079067134

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