Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5886027031abd3…

MALICIOUS

PDF

74.0 KB Created: 2021-04-01 02:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 39737095fbf89797237bb4e007b85c3b SHA-1: a2d9cc66b55d72985f706078e8daff1b1ba4843a SHA-256: da5886027031abd3be55a05b1652be4494268dac235f1b0c7c358aa5b5eb64ea
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to its creation by wkhtmltopdf, and the presence of embedded URLs further supports the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=are+farm+electric+fences+safe+for+dogs PDF link annotation
    • http://sdfafq.info/721523985930fbi6.pdfIn PDF document text
    • http://agentsecure.space/35034976796tar2w.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/4612753.pdfIn PDF document text
    • https://butusokusumowa.weebly.com/uploads/1/3/5/2/135294155/c5fd2de8f25dc.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/suropomoviwotop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387430/normal_60090a0f05cf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_601c5ccac66f4.pdfIn PDF document text
    • http://sazasebum.iblogger.org/ejemplos_de_diagrama_bimanual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484609/normal_5fcd990d25431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447433/normal_6051e22497414.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://falivodekolulo.epizy.com/80729093415.pdfIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_5409372df38a4554add86f4f5ae01b93.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_efc3976a9d734207a8a07e58f80fe1a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d82ed5-c647-4b55-9c00-3bae01d6b442/ganetono.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_4df2d928a6104bf19a8d2c5131b7fc79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/952ab5f1-593e-423e-8516-9903d2e8829f/4075508199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0798e4-87e9-4ce7-bca8-4b72f076e822/what_angel_number_644_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79cc9b91-5299-44a1-a308-1cc7faa8b86d/74451581399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e92b5d5-6ba3-49bf-9ca1-9f1d9639472f/vovozedorix.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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 5328 bytes
SHA-256: 8d0a4a5b6ede69028e8f0d1e861ef8eacd16c581c678299d913bb79d0e2e635f
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 10960 bytes
SHA-256: f35de9d9a562d6267ac37d4980695012b0b38bc735cd38f7a381e0dfb0f19de5