Malicious PDF — malware analysis report

Static analysis result for SHA-256 118c4595df328c7f…

MALICIOUS

PDF

76.5 KB Created: 2021-02-20 11:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1ac46c4c54164f9f4c8135aab0241d27 SHA-1: 374fafd9849c869f05a7ca925b82cc93a98b03d3 SHA-256: 118c4595df328c7f2ccb6e7d50ea6d0e4d082da0a7aef055f402b6b9a556535e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on various domains. The presence of a large number of external links, some on disposable hosting, suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of its specific payload or delivery mechanism.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/strik?utm_term=1984+book+study+questions+and+answers PDF link annotation
    • https://fezugewibopav.weebly.com/uploads/1/3/5/3/135346468/3393178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379626/normal_5fcaf2cecda52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_601a5a36c19be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_600b8f55198fc.pdfIn PDF document text
    • https://degemojo.weebly.com/uploads/1/3/1/4/131407655/cdcb7aa.pdfIn PDF document text
    • https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/gikadibazevuxuji.pdfIn PDF document text
    • http://paxawujaxoda.22web.org/dujepirok.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/lotesuwome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_6030a2ad6d9b1.pdfIn PDF document text
    • https://wezisewego.weebly.com/uploads/1/3/5/3/135342704/05f349362.pdfIn PDF document text
    • https://lesamasipedu.weebly.com/uploads/1/3/0/7/130739144/nuvodulisero-nigowo-popavemexodigid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doxewadafexe.rf.gd/63877142069.pdfIn PDF document text
    • http://rukukuwozar.epizy.com/cw_brute_force_0._5_pc.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_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 5708 bytes
SHA-256: 71e50e1651170b2570e03fdd6dd12147479d693e0825445387225f790da38621
font_01_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 10496 bytes
SHA-256: e0471e67e3e7ad854887e5f99ce83ff8a0cd2d653d907a74077aa347387cf952

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