Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f3ac2fd80c6abd…

MALICIOUS

PDF

63.7 KB Created: 2021-01-17 01:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3d2ed196d2b22550183e6f4785a71d90 SHA-1: 3fec6d327b625e06edb80852b60f9f20e59abc4f SHA-256: 44f3ac2fd80c6abdf0fe222c44a3a3cf8d019430621b1c5527e7efd1d8743cf0
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 at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of numerous external links suggests a link farm or phishing campaign.

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://traffmen.ru/123?utm_term=complainte+de+la+butte+piano In PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_5fadf5b51b34c.pdfIn PDF document text
    • https://cdn.sqhk.co/jaguwubax/gcqjjlV/55885034031.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/25ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5f9994086ffe3.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/hgidBSk/vexivogano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_5fa4012663a81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501503/normal_5ff957af53b4a.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatapegil/ajhW8hg/royal_farms_gas_station_ashburn_va.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/jcfijjd/dress_up_party_salon_girl.pdfIn PDF document text
    • https://wavutokemik.weebly.com/uploads/1/3/4/3/134309613/9278877.pdfIn PDF document text
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/63ce221781.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jifgi7b/2481532363.pdfIn PDF document text
    • https://mawovajexajadow.weebly.com/uploads/1/3/0/8/130874262/madixuledolise_juwuxafikimib_pumomavarilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1B 4876 bytes
SHA-256: 9cb61c575ae75a2c7c829b7aa9158fb41e3a795317b075dbd1f1704e674082bd
font_01_sfnt_off0000cb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 11536 bytes
SHA-256: a0fec77bc72f723f614c8148470904bdc144cb8661e3f212f19f8fdb2165f213

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