Malicious PDF — malware analysis report

Static analysis result for SHA-256 a590ac3b27d13871…

MALICIOUS

PDF

67.1 KB Created: 2020-11-22 00:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 38aa9f66963ef0c1055a9931634877f2 SHA-1: b2fbfb7d6300e74d326f84267bea4134bdbf190e SHA-256: a590ac3b27d13871a5394b44ba7b22b63fe4c836067a7f5b45f7329b0b226ed3
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gettraff.ru/123?utm_term=donna+doctor+who+imdb In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5fa2e2cdce134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_5fa47d24636f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_5fb81dd049b73.pdfIn PDF document text
    • https://modudipagif.weebly.com/uploads/1/3/4/6/134688888/miwajoguneluzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f91bd40506bf.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/5715157.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/sevoga/28044774533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a9e5c5-3ae0-4ec8-9ba4-de5db7818baa/zejimirebukudumurakusawu.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/gabixukepidojajezatar.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_off0000c73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 5200 bytes
SHA-256: 113ff46c6920f661ac81c5a3f547631a85bf791c18897aa88f4297a7b034d407
font_01_sfnt_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 11488 bytes
SHA-256: 07de2d9ab9e63bf5c1c504145cac703bdec795627966237edf91e82b5eefcf83

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