Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd3ac6662df9f46…

MALICIOUS

PDF

64.0 KB Created: 2020-11-14 19:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: af5161d6a5fa5813175fe8b79d9e8e76 SHA-1: 1f9bae4da14174a062c7f2d53beff7c37aa8d0fa SHA-256: 9fd3ac6662df9f468daa716ca04cf950d9b16e5284eeedf91eead56d339067ff
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm on disposable hosting. The embedded URLs and the structure of the document suggest it is designed to direct users to potentially harmful websites, possibly for phishing or SEO manipulation. The ML classifier and ClamAV detection further support its malicious nature.

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://gettraff.ru/aws?utm_term=cervical+cancer+screening+canada+guidelines In PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/zebafefugurusodivu.pdfIn PDF document text
    • https://sivivaleretuvu.weebly.com/uploads/1/3/4/3/134324596/dudipu-lezamute-dikosimu-vomozusebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f957c07c7df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_5f9a1fec2a5e2.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/gorubixisi.pdfIn PDF document text
    • https://rofetavagamufup.weebly.com/uploads/1/3/4/3/134373504/800c83652885.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/xamotodovaban_gifeja_makirujumog_tepibi.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/7569923.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/2750785.pdfIn PDF document text
    • https://muwidewosavuli.weebly.com/uploads/1/3/4/4/134435377/5311062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_5fa6f50ad4e2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413703/normal_5f9fd76b16799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447626/normal_5f9eeb7f470d1.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/zavilu_kalajotokoreb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f98cf3ee8d6c.pdfIn PDF document text
    • https://vekatugid.weebly.com/uploads/1/3/4/5/134592715/34713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000be42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE42 5072 bytes
SHA-256: 16fba0bf431c9cc76795d1ff84210f09b14c91b221b4e0d6e27f329ed6b6094a
font_01_sfnt_off0000cf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF90 10400 bytes
SHA-256: 060c8cebece7a5cca2e7f079ec8cd22260f3f7ba0e7189f7db9d82e250cd2ea2

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