Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b4b33c7d152a44…

MALICIOUS

PDF

61.1 KB Created: 2020-12-20 04:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c7f217b0a6d8693d6900e9313401d40b SHA-1: 14bbb36f2af86e621150a7dbd46777ffc5249468 SHA-256: c0b4b33c7d152a4418427e15784c366207dc046dc38072e7b5fc148bf29f58f2
156 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 embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/strik?utm_term=infinite+campus+bayless PDF link annotation
    • https://fulimutalez.weebly.com/uploads/1/3/4/5/134599943/28520b70.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/zexozazejej-kowewilavafegi-fikitaxu.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/jamewurogekixaruri.pdfIn PDF document text
    • https://jutoduxozerepep.weebly.com/uploads/1/3/4/5/134599773/ronorabut.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/2d4fbf98-11a4-4312-8f56-c2dd71d5775a/keva_juice_menu_sparks_nv.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/cd4093be_ic_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/99355181924.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/sozanulimak.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/honda_performance_parts_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/children_s_abc_books.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_off0000b1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D7 5244 bytes
SHA-256: 11b8fc2b9e6bf138196a066ac6d666dcb7cb847dc318601e6354e5f1f5a13a2a
font_01_sfnt_off0000c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 10772 bytes
SHA-256: 71f587f12d3b94571631c599227326478f4d88de4be65701483f55e7999df903

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