Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e46daab7c2d57e1…

MALICIOUS

PDF

65.0 KB Created: 2020-11-17 10:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85b3a6c0463aa6c57d7ead48ad43cad4 SHA-1: 54b7464a726a0977a487ec6bb8a0714a6a8bc819 SHA-256: 8e46daab7c2d57e15dfa161870ecc40c0895a9170da880a75c2bb649248ad604
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though partially corrupted, suggests a lure related to academic content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=cinetica+de+crecimiento+microbiano+ejercicios+resueltos
    • https://xijanejomasug.weebly.com/uploads/1/3/4/5/134506458/dilowupajug.pdf
    • https://cdn-cms.f-static.net/uploads/4466151/normal_5fae6e87efa9c.pdf
    • https://rezolokad.weebly.com/uploads/1/3/4/7/134718373/gelifuburagero.pdf
    • https://cdn-cms.f-static.net/uploads/4411483/normal_5fa63d97f3c29.pdf
    • https://cdn-cms.f-static.net/uploads/4383800/normal_5faf8027b3d56.pdf
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/sagisagajopa.pdf
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5f8cbafddd91a.pdf
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/8264043.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/podawakumepewez/latest_tamil_album_audio_songs_free.pdf
    • https://uploads.strikinglycdn.com/files/3978dc20-50fc-40d5-900c-5ab02bd09aca/superacion_personal_definicion.pdf
    • https://uploads.strikinglycdn.com/files/30dcf686-79e1-4038-9470-d40d3cf1434e/32503161786.pdf
    • https://s3.amazonaws.com/xatojem/molarity_chemistry_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2b0.bin
218d747fd0f09bf7a2d43e4ce859ed355f48df7cc02b5a6d7d297e65c48e799e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B0 5208 bytes
font_01_sfnt_off0000d447.bin
4322d7322465a67a0ff9e6b56ba689e0e2f401cce0afe0ce3f132d358ec0c36a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 10024 bytes