Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b55dbac5c242dd…

MALICIOUS

PDF

99.0 KB Created: 2020-12-01 21:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bab658b346fa3be4e3a0fbd8435abb3f SHA-1: e38f5190116296d35d09b260b939102da5bb67e0 SHA-256: 14b55dbac5c242ddc51eb13c4e6cdf91fdec5e470a38316cda6db4c9a2c87418
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 one identified as a known malicious redirector. This suggests the document is designed to direct users to malicious websites, potentially for phishing or to host further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=cardiomyopathie+dilat%25C3%25A9e+pdf+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_5f8a940329459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_5fa533e5a8bad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_5fc11b3130ecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5f9275db87ab7.pdfIn PDF document text
    • https://dudabiwik.weebly.com/uploads/1/3/4/3/134354119/xiwimope.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/sinafawaviziz_lojeje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf456f3de5e49b529a959/1606284375644/68016167126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27010fab-3ac5-4fa3-9725-f21eefb944d7/zevusof.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc101f96609fd0ee791e489/t/5fc162e53570fb44d1368c6c/1606509286146/social_security_office_bronx_ny_10462.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe431e4e98326c02dc5978/1606304544046/10334301525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47409ec1-ef9e-4d1c-968a-9fabb99b520e/divinity_2_secrets_of_the_dwarves.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eacbc14dfd36fef1915a/t/5fc1a3feeaf37e3b64da263b/1606525950713/30258913923.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1c67f8cdb769c6abcb1d/1606294634223/siu_carbondale_campus_map.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_off00013e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3C 5772 bytes
SHA-256: a87c322dcb87ac60587433573e1fda82f589aa3c500cc61d96bc9780c6ea346c
font_01_sfnt_off0001517d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517D 14076 bytes
SHA-256: de5fabe9cfc938bea3264f4000a26d43f5f837ed8b60acb4674d2fb5a377bd1f

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