Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52080b9d5d19f92…

MALICIOUS

PDF

60.2 KB Created: 2020-11-24 07:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 928583336797fb4ea4cd083ee8c9b15d SHA-1: 7f0d618efa6405cd1517b33bda2c80d09ef7b30f SHA-256: e52080b9d5d19f9281594a0a8a6b7be62e7e91e2819019bbbe18730f236a607f
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are part of a link farm designed to distribute malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to a known malicious redirector, indicating an attempt to deliver a payload. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/aws?utm_term=guillotine+game+the+french+revolution+answers In PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/zewepidisuwide.pdfIn PDF document text
    • https://mobakuwi.weebly.com/uploads/1/3/4/4/134404075/bc45a.pdfIn PDF document text
    • https://sugibovipebu.weebly.com/uploads/1/3/4/7/134705953/xarilef-wosufafixak-tozaxajukasi-vujogesujima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f97eb697ceaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449965/normal_5faf07d217199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_5fad75157210d.pdfIn PDF document text
    • https://xesamubi.weebly.com/uploads/1/3/4/0/134095888/03d7dc9d0c80fad.pdfIn PDF document text
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/vasidodikin_xanilenisugi_denumomef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_5fa53f114161b.pdfIn PDF document text
    • https://pudozewo.weebly.com/uploads/1/3/4/3/134311846/6032035.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/zeworibuzoza/mupijipazasetufepa.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/wulemeboxukunuzasij.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/34861833175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0451b7f-87d4-4a3f-9d06-609d72bda431/mijaxexiruxomudovozeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f53a31-e4fc-4014-b340-0a00ab986220/rich_dad_cashflow_quadrant.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/section_3_the_behavior_of_waves_answers.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_off0000afb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB9 5476 bytes
SHA-256: 82b8cb346f00a5482e6fe7630522445d4191202dad2a7bf4301828ab186227ef
font_01_sfnt_off0000c24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24F 9800 bytes
SHA-256: 5846405bc6323adab31ebe654732f5a5829f8666f1227a5bea1e415e75a79900

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