Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f51b4830813f60…

MALICIOUS

PDF

64.6 KB Created: 2020-12-18 13:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b5e4b26dc48555b3e876f5a7cb605e03 SHA-1: 7e5636504424e740bcdbd69eed44ac431011b418 SHA-256: e1f51b4830813f60b398272051916c5a43a22a904cb1686a8f9825f6f396c52c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Weebly domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojanized PDF. The presence of embedded URLs and the heuristic firings for malicious redirectors and link farms support this assessment.

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://traffine.ru/123?utm_term=end+of+my+rope In PDF document text
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/48e5ecea2e6c3.pdfIn PDF document text
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/sirozob.pdfIn PDF document text
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/a2c976146fff.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/71b9fa8eeb5a7f.pdfIn PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/nugigopogapozofex.pdfIn PDF document text
    • https://botironuz.weebly.com/uploads/1/3/1/3/131380999/4e5100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f9c4e031cf23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420244/normal_5fb301198ecb4.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/molopezof_lipomi_wazitis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_5fbae9aa59ca2.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/dazutun/atresia_pulmonal_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/fofitiju.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/calligraphy_layout_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/thank_you_teacher_printable_template.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_off0000bfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE7 4828 bytes
SHA-256: f321c47329e20babbc3cecf0ab9fbb477e9206bcc6d9a98619621b40ec17d2bd
font_01_sfnt_off0000d04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04C 11504 bytes
SHA-256: 9dab9d256f18f8e7578630970eb7887598c5ebf2bf43a8fd843af252cec1b168

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