Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62b4ded7efd6a5c…

MALICIOUS

PDF

61.1 KB Created: 2020-11-17 05:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c4bbb36024117cd5d7af24816351fa9b SHA-1: d91c1d28b7d1541a7e10378464174f8897bf9f1e SHA-256: a62b4ded7efd6a5c3541775a56e71aca56a5ba134295599a4f32e3718cc7d519
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 0.9996

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://trafftec.ru/strik?utm_term=liberian+girl+mp3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5f91304ab7295.pdfIn PDF document text
    • https://litaxavuve.weebly.com/uploads/1/3/4/8/134848922/gukam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_5fa4062cdeae2.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7702792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446491/normal_5fa736101464c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383572/normal_5f949de5eaea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379483/normal_5fae75d8432d4.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/d549da259ed0cb.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/3c61d99f-a1a0-4076-bb87-6b8ddc42591e/uhaul_late_fee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d04d059-1c76-41be-b9d5-f57534e3c524/51398832485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e3bef1-df7a-4c5b-8222-29f47e4a528b/64643767298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2355acd7-9875-4219-9522-96ce6f132601/73748685262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54af1a1-fb34-46f8-a197-6cbdc4cac7cd/mawikitas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003e362a-0be1-4572-a350-c23884d2231d/jipikabonibirexuxi.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_off0000af52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF52 5208 bytes
SHA-256: 6aca067d9d691cc631e2142cf04793f93cd6274cf2c3f69fb9677f26d3f5c884
font_01_sfnt_off0000c0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FB 12100 bytes
SHA-256: 393f438de8e214e2a4977694bcca3abe566f6cf0e4a557193bac08a9b8ced212

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