Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f7167e73dda55e…

MALICIOUS

PDF

73.3 KB Created: 2020-12-17 04:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 099a96ee0cc94883f547141404f81117 SHA-1: ef913b9356f214b1b44d73e81dd2b565e9eb18fb SHA-256: 81f7167e73dda55ea15456c2ea5bb85f23b111d6bdc642ce7014aed6c761dc83
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with at least one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, suggesting the document's primary purpose is to drive traffic to external sites. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware delivery.

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/123?utm_term=ffxiv+5.0+desynthesis+guide+culinarian In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_5f95696a96d6e.pdfIn PDF document text
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/91d506852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fb9ecc3ccf30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5fdaabb624ead.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/d1ee3c84.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/058297c2-106e-4eaa-ad2d-b1c18265caf6/42097661579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e29e7e3-a79e-482a-9bbc-d123716b97ce/stem_fairy_tale_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8ee080-927a-4329-a97a-8e5ca34366d7/vopuzusozudulitezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31fcefdb-0ef0-47a8-b5f6-8e2b896b70d7/10116100479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97158487-fe62-4870-9950-08f49d1eaa79/senior_instructional_designer_salary_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6915f5c7-4df2-4399-b880-86729efb5774/xexexosozulul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b8a674-324b-4e95-ac2e-64f3f0d2c6d1/ramejomotid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c3ac3b-2c73-4b92-b258-aa722f633d12/rorajokedagidanatuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5d8aa2-cb8a-4f8f-88a0-c8f753368979/mrs._taylor_s_galliard.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_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 5764 bytes
SHA-256: db3026b889334b6bb8fcb547cce9f127cef2eba4da19397bdf0c7bf33fc8cdf7
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 10832 bytes
SHA-256: 47b58f08b5d851cdbafe467bb77cd81af6c9a17968ddea6e795accd8b4bf10cf

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