Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb8c3e410ab1b39…

MALICIOUS

PDF

142.4 KB Created: 2020-11-18 20:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 6b27e22c48e5359d886656ab2ffba176 SHA-1: f87332c48c11a9d47f4a3d2f1ff0a25ff3e904f6 SHA-256: 9cb8c3e410ab1b39e1f7402977fc321cf55bda5ff93a3050ec4cfc77dbfacca9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or ad fraud. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/123?utm_term=better+life+game+nancy+drew PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386361/normal_5f994f56d1a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5fa0e02f4ad28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5faad3970202c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f8730e7993ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_5f98501c49bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_5fb3ee169bf51.pdfIn PDF document text
    • https://xuxavapivobe.weebly.com/uploads/1/3/4/5/134590147/6316907.pdfIn PDF document text
    • https://semezuzuxikazug.weebly.com/uploads/1/3/4/2/134234688/9391851.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/d925e83ad4595.pdfIn PDF document text
    • https://sagupegijugix.weebly.com/uploads/1/3/4/4/134443219/sufizemedujiko.pdfIn PDF document text
    • https://kikuvabafot.weebly.com/uploads/1/3/4/3/134332304/bewufovolo.pdfIn PDF document text
    • https://kadefetu.weebly.com/uploads/1/3/4/4/134471860/3644a8fb9c6ae.pdfIn PDF document text
    • https://resowijex.weebly.com/uploads/1/3/4/6/134681832/15aa884aa0cef7.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/rizezobabub/86462142466.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/balance_sheet_excel_template_india.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/present_tense_past_tense_future_tense_verb_table.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_off0001efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFA3 5408 bytes
SHA-256: 88789d25d8e8eb59ade79617386ebfba472db7b0ed500a476b18aa4ddf08d834
font_01_sfnt_off0002020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2020D 13016 bytes
SHA-256: 16ae58b558ff216d64f9f9f4bd646c28ee5b45008f3a0d5cba5f5001529d2e3a

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