Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f99df391bcbd32…

MALICIOUS

PDF

68.1 KB Created: 2020-12-15 02:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ab8de74f94aafffc6abd0cdad869921a SHA-1: 7653162d964d0d38a6f0640ec22525584c924dd7 SHA-256: a5f99df391bcbd32a05952ea106102a7ae23cbc168b9809fe652dc99ae8743d4
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate this PDF is designed to lead users to malicious infrastructure, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users via malicious content.

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=subwoofer+bass+pro+apk+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5fb8aa5acf861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f90906fcb1b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_5fbf01deea562.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/1446731.pdfIn PDF document text
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/d5daae0ab1d3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc68f7488c99b6d37ce80fd/t/5fcd5ed83ff1011540035b56/1607294681517/virtual_dj_mixer_software_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52574e26-27e4-4164-a621-565488f35f88/lidozov.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c2059698b02c7f395ada/t/5fd0b93a06d21916ed742201/1607514426782/exodus_20_kjv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d4a68f-aab3-48ad-bfe0-1d69bd5cf4c8/6534692178.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc016b9c30a162e0c4e17a3/t/5fc1b717173fb5383be2d588/1606530840625/elder_scrolls_anthology_product_code_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd42419-5f95-4d97-a0a9-2540d9abe8ae/mitezegetakipajobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b094bbee-a186-4844-a257-3650aad10a0c/how_to_draw_a_straight_line_in_photoshop_elements_15.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_off0000cac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC0 5400 bytes
SHA-256: ef7b778e595ba3eb18b273ba9cf131c57bdc1b11870dfce86f68046c91823792
font_01_sfnt_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 10872 bytes
SHA-256: 49a3197bb4d73f6761ab8da0610a82b97241304f90443cd35d4ae404dc465cc8

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