Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ec09bd79b11e79…

MALICIOUS

PDF

81.7 KB Created: 2021-02-20 15:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: dc733dd7abfe99aafca4c494e09dc195 SHA-1: 71b7c834ce6a09f302a76fe1d1e9184274c5fb62 SHA-256: 22ec09bd79b11e7963334ae992519721c2d9416f6aa15d583a86055209f1101b
244 Risk Score

Malware Insights

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

This PDF document has been identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, suggesting an attempt to lead users to malicious sites. The document body is heavily obfuscated and contains what appears to be junk data, further indicating malicious intent rather than legitimate 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
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=george+foreman+grill+meat+cooking+times In PDF document text
    • https://lufodeku.weebly.com/uploads/1/3/4/5/134586195/478800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379859/normal_6009c761107e6.pdfIn PDF document text
    • https://lifulufo.weebly.com/uploads/1/3/1/3/131379971/dufegijax_timapoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475204/normal_6023c9787f471.pdfIn PDF document text
    • https://vuligezu.weebly.com/uploads/1/3/5/3/135391643/gowed-nujakenawej-jesixedi.pdfIn PDF document text
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/8372397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388827/normal_602269a900bc9.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/pepezubukirege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_60280ae0d0b99.pdfIn PDF document text
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/sesixadiso_redurarapovudug_suzipizeso_punutowozuj.pdfIn PDF document text
    • https://tapuroxoj.weebly.com/uploads/1/3/4/5/134599682/giwevimora-kiroj.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/gajetomo.pdfIn PDF document text
    • https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/nusuwar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5fd7ce200f71f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://digotadegijo.epizy.com/correlation_questions_and_answers.pdfIn PDF document text
    • http://gajoruza.epizy.com/anthony_de_mello_quotes_fear.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_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 5296 bytes
SHA-256: 886430d1e1dee473f652f4579ae688bf731e6dbfe59e2442648c993db1d20237
font_01_sfnt_off000112dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 11464 bytes
SHA-256: 44ae7ed0ff785d8d4e52e95d800ac95fcd15742eb1153716cea2b3d29321ec48

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