Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b5d756964961d5…

MALICIOUS

PDF

75.5 KB Created: 2021-01-04 01:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0f11784764a446e4a0fd12a999433f12 SHA-1: 7316df67440047faa04e78196362e6212e6105fb SHA-256: 13b5d756964961d5209161af2f5d3952991a48db931528e9ef8117d57c705d45
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, alongside a PDF link farm heuristic. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery. The ClamAV detection further supports its malicious nature.

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=bracken+brown+magnolia+information In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f95baf6f1100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451970/normal_5fe3d575ee77e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_5fc2c5d677092.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/d836f8bc7e6407e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5fabf8b389a88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f8ba8be69789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427268/normal_5fcb0df171be5.pdfIn PDF document text
    • https://peliwotamo.weebly.com/uploads/1/3/5/3/135325711/114830.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4cfeb8f-7eba-4561-b364-47a214e67891/eastview_high_school_band.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/web_templates_html5_responsive.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/aat_bookkeeping_controls.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/espring_water_filter_100186.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/36531037068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0f04a9-e39a-4f48-bc27-fd7d7e90560f/tabotaropezuxoxulezisiram.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_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 5368 bytes
SHA-256: 2fa2a2475dd85b015071251a7c69bd222b6037c904d7f484f597299377a2d1d9
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 10840 bytes
SHA-256: 1ca4191d070fcabe8cfa90491aaae3f27e86d0aa55a596fee18c4856d3f2bc44

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