Malicious PDF — malware analysis report

Static analysis result for SHA-256 576d773fc20df6d5…

MALICIOUS

PDF

98.3 KB Created: 2021-05-04 06:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fbbd3b913d6fbc140d104332f355641c SHA-1: d7e3e0e1eb08b55d528db72412ef0ecc1b83e9a8 SHA-256: 576d773fc20df6d5878edd90edf1e5a3397f596571fcec2d3776191e36be6fd4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a potential redirection to malicious sites, possibly leveraging embedded JavaScript within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/strik?utm_term=what+intermolecular+forces+are+present+in+ch4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fd61353e85ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5fcd518b1414e.pdfIn PDF document text
    • https://wixezijuni.weebly.com/uploads/1/3/5/3/135312108/xuxoxadax-namatoki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500897/normal_5fdd177033e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_6055b73f14fa7.pdfIn PDF document text
    • https://zutuwukesid.weebly.com/uploads/1/3/4/6/134624341/3258814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465702/normal_5ff6320b71e50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490739/normal_5fd798c211d05.pdfIn PDF document text
    • https://tujarabevazedi.weebly.com/uploads/1/3/4/2/134235746/filuxepogomom-kusodefawinodi-rujabamati.pdfIn PDF document text
    • https://gulipuzajetag.weebly.com/uploads/1/3/5/3/135397689/1462306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_605df4e57d1c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_601ffdafb343d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5ffa37bc4e336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496818/normal_60047a0724570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406782/normal_602655f27bbbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421937/normal_5fed2a11a6783.pdfIn PDF document text
    • https://menegelobeka.weebly.com/uploads/1/3/4/9/134903334/bbb328ca94bd.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/geradi/25072278289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c28626a-7276-4ebd-8ebc-d16f17e1fcdc/dejak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff41e43e-f167-4208-842f-cd6a348002ed/xafejos.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/tax_law_opinion_letter_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c240eaf0-a143-4f12-b397-180f5c7ce973/datamax_i-4208_driver_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9021cbe-d172-47c3-8795-6724318e9a7d/lord_of_the_rings_1_parts_in_hindi_free_download_mp4moviez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0703345b-4a92-44d4-8e3c-2997bf39d79b/hp_designjet_500_plus_42_driver_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/64881417342.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 5356 bytes
SHA-256: 90f8c946a994d3f3c6ae7514c5d054c238ac3fda81dcba9ea517b1a189746f6d
font_01_sfnt_off00013e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3F 11624 bytes
SHA-256: 23367b689dc4003a98bbe64bbdb4be1ff8b75dbe3a83ab9b5742bd9b78fd6e3e
font_02_sfnt_off0001663c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1663C 16084 bytes
SHA-256: 1513cff1140ee46b119fd1f1a8d89226c35fa745519edd36504e398b791a408b