Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e56230ed0c4339…

MALICIOUS

PDF

83.3 KB Created: 2020-11-23 15:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5590daad1bc9c3e3a6b7e05be7ea2cae SHA-1: e5271215dfaf764057667c41999f77f475bb3068 SHA-256: a2e56230ed0c43394dbbfadea2e969e06840e5426d32900d971ed1593d3b258a
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with heuristics identifying it as a link farm and a redirector to malicious infrastructure. The ClamAV detection and ML classifier further support its malicious nature. The primary IOC is the redirector URL, which is likely used to funnel victims to phishing or malware sites.

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://gettraff.ru/strik?utm_term=afk+fishing+black+desert In PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/fakemozu-wevebamaj-potimox-remosag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401994/normal_5f924ec33ed4c.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/siwejutifub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5f8bc7bbb635a.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/vuzivewe.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/jupudizadid/m_l_a_full_form_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/76575025971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18f3ba1-bfcc-4375-9b2f-abf589030cf6/42675080643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f694b88e-0785-44b3-bb04-ec758092a20d/zerinupok.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/lulagol.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/caminante_no_hay_camino_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c268192-013f-40e2-aeff-2b6cf5645f24/58855650179.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/gekina.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_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 5476 bytes
SHA-256: 6d97bf0bc43159facd7ad089f3f81a4c92599c7e1b343a2308f0d15650ad2b7d
font_01_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 11820 bytes
SHA-256: 0762cac3e303908331f1d9c95ee4346d601b6e304643481f548e26c436db9ba5

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