Malicious PDF — malware analysis report

Static analysis result for SHA-256 f951fd1ca39140e6…

MALICIOUS

PDF

60.0 KB Created: 2021-01-06 09:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 906344f97d9947340db47299010cbd64 SHA-1: 87c5ff5dbb5cff027598c28934fa3bd7d4486197 SHA-256: f951fd1ca39140e697935d954d259e0b2fb679b65d041d120052944729d920fa
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external resources, and one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous links suggest it's designed to redirect users to potentially harmful content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffking.ru/aws?utm_term=bahamas+bold+font+family+free In PDF document text
    • https://cdn.sqhk.co/xeposetuge/hEPlih2/narrator_s_voice_latest_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490123/normal_5ff364692e5ff.pdfIn PDF document text
    • https://cdn.sqhk.co/satovepato/dibjfPT/navy_field_2_download_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_5fd9e53304d9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_5f9b82a316e8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f91f6fbdaccd.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/a25a56a7f.pdfIn PDF document text
    • https://niladituzisum.weebly.com/uploads/1/3/4/7/134736231/dilipelejuretokewa.pdfIn PDF document text
    • https://cdn.sqhk.co/mofinopedas/rtb2wih/rolevo.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/7e7a39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fbc35bd8c965.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/nupotukig/area_and_perimeter_of_sectors_worksheet.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_off0000afaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAF 5440 bytes
SHA-256: 6c18ecdc76c3e6eaa64f4b20ae8fec2db3fd4484151ee81598dd213b65b53dbf
font_01_sfnt_off0000c207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC207 9604 bytes
SHA-256: df9b8c15818243bc35775a2664a902962757ecf86e455e9391fe2c8b03a7cdaf

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