Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d153495b0bbecc…

MALICIOUS

PDF

65.5 KB Created: 2020-11-13 19:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 41498a224995eece9ecd06c63474d570 SHA-1: d841160f14601053fbedebedeb7e3d61c9b1f3af SHA-256: 81d153495b0bbecc594511f7efe9d9e9402b3683ea79f93e6413eeab62153541
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=hungry+shark+para+hile+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446259/normal_5fa3351f7d43d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_5f9fd49cc871b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5f90874f25f90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f87be7f4b22e.pdfIn PDF document text
    • https://lejoxenususoja.weebly.com/uploads/1/3/4/4/134497781/4594116.pdfIn PDF document text
    • https://xezujexowesujol.weebly.com/uploads/1/3/4/5/134502134/vasome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5f9fe29e4af53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_5fa3528328a61.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/dinisemowoge/kim_dong_yoon_produce_x_101.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/dapaxikivasamiliwavisi.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/abbyy_transformer_12_serial_number.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_off0000c4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 5208 bytes
SHA-256: 95269fe90c1592fc2b3409e74cc3af65d53a34135c38220dd6e1eb50427a8538
font_01_sfnt_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 10324 bytes
SHA-256: 2ea3bf74eea5ee245c55b6d133def5cc15cdc074c8ebf8433e800cdc565ea509

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