Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a57812e558a5f52…

MALICIOUS

PDF

137.8 KB Created: 2021-02-25 00:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 939730221cc4e183789809e6cad021e4 SHA-1: 0121b9e8ea19b9e3b4844792b3bf72be8237b558 SHA-256: 5a57812e558a5f5250a57412f0d86e1a1ae7f2b512c8684ad428b0246e9e09d1
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing or trojan variant. The primary function appears to be directing users to a network of linked PDFs, likely for SEO spam or to distribute further malware.

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
  • 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://crophysi.ru/strik?utm_term=what+does+blue+falcon+mean+in+german In PDF document text
    • https://static.s123-cdn-static.com/uploads/4412894/normal_5fce01597e098.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/94626778090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_5fe7ff902aded.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/kunowojajowakuki.pdfIn PDF document text
    • https://fonabanobegax.weebly.com/uploads/1/3/1/6/131636781/mijenawezigurezimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_600ef497de4c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_5fd1bb9814d27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489057/normal_5fd03be4ed96f.pdfIn PDF document text
    • http://gayerkan.com/86923953825l4rk.pdfIn PDF document text
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/5390035.pdfIn PDF document text
    • http://ellmax-site.xyz/prominent_d1c_chlorine_analyzer_manualj5lmz.pdfIn PDF document text
    • https://pixumoxijabana.weebly.com/uploads/1/3/4/7/134748481/9193168.pdfIn PDF document text
    • http://accface.in/526791480900v8rq.pdfIn PDF document text
    • http://vutazumadik.iblogger.org/free_disney_movie_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426066/normal_5fda69bc71e15.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_off0001dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFB4 5588 bytes
SHA-256: 2fa243a9dd1fb90ec50d1266bf6b079df470f3321a26d6a89e1a2e2b95e728e9
font_01_sfnt_off0001f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F295 11472 bytes
SHA-256: b7b85d73b40a9348c5f738d7d5d8097e2dbab56f37859a14beb42b46ba248409

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