Malicious PDF — malware analysis report

Static analysis result for SHA-256 32aa0c595019e9c0…

MALICIOUS

PDF

68.9 KB Created: 2020-12-29 12:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5a0e9936715ea5a087a86c18ece9f17b SHA-1: eeb5c1e357c236d0651b693efe77ce8f95100fef SHA-256: 32aa0c595019e9c03a871f673104388eed23192f9cf921ab7e2128571edc2c0f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The presence of numerous external PDF links suggests a link farm or SEO manipulation strategy, potentially to distribute malicious content or improve search engine ranking for malicious sites. No scripts were extracted, but the PDF structure itself is used to host and link to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=best+3d+archery+quiver In PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/8769248.pdfIn PDF document text
    • https://sugovodeko.weebly.com/uploads/1/3/2/6/132681033/4b2189e70.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/jqLigjJ/best_space_battle_games_android.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/05vMhe6/nutevijutixobafukozavope.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/iiAghhb/57737981879.pdfIn PDF document text
    • https://cdn.sqhk.co/wodigajamu/EgiEjbC/super_retro_16_full_version_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_5fc9e8aa7702d.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/zunaporam/keynote_sales_presentation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/sample_leave_application_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c80445-3a5d-46f0-80a8-b5167164c006/37388847741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18960866-2bdd-4969-9a34-813105ebdb0e/20305470819.pdfIn PDF document text
    • https://s3.amazonaws.com/kepevipawit/29950905650.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/noviwib.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/fitepatenidopomofo.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_off0000d218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD218 5496 bytes
SHA-256: 927920e8f530d1a0a795a9ffdf1032f7f990a356840a801774773983c488aec3
font_01_sfnt_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 9972 bytes
SHA-256: c67d9c5676aa29ffc937db322322284b2311615dd4541ae64ab5ed2237640d61

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