Malicious PDF — malware analysis report

Static analysis result for SHA-256 0945647752161fe2…

MALICIOUS

PDF

70.0 KB Created: 2021-02-17 19:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ee5bbb7ba384ae4b2b5f84d49609019f SHA-1: 535330972e26a22890bcf518040c33dba4fe9934 SHA-256: 0945647752161fe26cf408ef62c337537b83bde4e616dc20bd53c4c5403931a7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL disguised as a karaoke machine guide. This indicates a phishing or scam attempt. The presence of numerous external links, many pointing to PDF files, suggests a link farm or SEO poisoning tactic to distribute malicious content. While no scripts were extracted, the PDF structure and embedded links are sufficient to infer a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+use+the+karaoke+singing+machine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_6011ddd6e4b7f.pdfIn PDF document text
    • http://003-center.ru/72689263320bzhq1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fd04cf245258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_601ae97159d7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389358/normal_5fcb6dead5a33.pdfIn PDF document text
    • https://bemozepe.weebly.com/uploads/1/3/0/7/130739793/d97674bd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413846/normal_5ff351ce3aeb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_5fd27c132068b.pdfIn PDF document text
    • http://mikenitoxa.22web.org/47180384077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490365/normal_601fb45d3173a.pdfIn PDF document text
    • http://figironeme.22web.org/contrastive_distribution.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_6019b5b2e2317.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/sulasatevirexo/34627475478.pdfIn PDF document text
    • http://kejakum.rf.gd/xevojopikimoduwevonisusu.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/free_now_hiring_flyer_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/30135581540.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/fetobozedoriwawiwubazik.pdfIn PDF document text
    • http://jamurujitexezi.epizy.com/company_vehicle_log_book_template.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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 5296 bytes
SHA-256: d790646246e85ca4071799c7395e4b0e92c47201c0b6f41a09e4b66d3e7de345
font_01_sfnt_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 10112 bytes
SHA-256: 55d0824f420df52d296bcf6aa7b5b1f667606d71ffd009a1f160d606140e12ba

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