Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d3c752550e60ef…

MALICIOUS

PDF

67.7 KB Created: 2021-01-01 10:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f0fc3b53fe6299ce3cbca2fac7a4718c SHA-1: 93b5da557e895c35f23628c0a9ebb344a83629ec SHA-256: 32d3c752550e60ef7cc69433dab577a055d608fb0229fee3af2644e1b9d0bad4
244 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 embedded links, many pointing to disposable hosting, and one specifically to a known malicious redirector. The ML classifier and ClamAV also flagged this file as malicious. The embedded URLs suggest a link farm designed to distribute malware or conduct phishing attacks, likely initiated via spearphishing.

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://cctraff.ru/123?utm_term=spark+the+definitive+guide+pdf+github In PDF document text
    • https://petobaxiteru.weebly.com/uploads/1/3/1/4/131407236/f756db39bbe.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/napimurafuzinina.pdfIn PDF document text
    • https://xitesinunupur.weebly.com/uploads/1/3/4/3/134318791/popilebikiveza-mutawanikadopex-lidexudoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5f9c3261a7980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_5fd2dd415aab3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5fe1b7501ae83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393791/normal_5fb7847a90d60.pdfIn PDF document text
    • https://fofulusi.weebly.com/uploads/1/3/4/7/134774969/6324858.pdfIn PDF document text
    • https://kinefevemupopit.weebly.com/uploads/1/3/4/6/134631160/9816534.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/3023568.pdfIn PDF document text
    • https://jikesisepam.weebly.com/uploads/1/3/1/4/131406861/efeed9faa69960f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5fbf568de1f7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5f9821f864cd2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3535b759-bafc-4c8f-b683-5cf9dd3904ef/pufetufin.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_off0000cbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 5460 bytes
SHA-256: 43ae19a4ee6e16f0b85e17d5bbab21d529bdf821e7980ba6a833010fe1d2e30b
font_01_sfnt_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 10472 bytes
SHA-256: ab0cf0cdbf29ea44882dbad0e881d8a0316dbddf2e551b1f842a61052fd01ab1

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