Malicious PDF — malware analysis report

Static analysis result for SHA-256 0857d90cb3715190…

MALICIOUS

PDF

64.7 KB Created: 2021-02-20 05:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8f1403f75f22353ddedd74fdcd833fd5 SHA-1: 2aab0bd2c201d6a2e52775cc71ad9022bbad6c95 SHA-256: 0857d90cb37151904f041a1795684bbb50de26cf768997042f1df1f06367638d
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 0.9998

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
  • 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://leonvi.ru/strik?utm_term=essick+air+humidifier+filters+1043 PDF link annotation
    • https://cdn.sqhk.co/gabadifofibo/6ghgiid/rusefuxazef.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/l2jbN0Y/85536976169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386333/normal_5fe173fe14534.pdfIn PDF document text
    • https://jekaboda.weebly.com/uploads/1/3/5/3/135398795/1188996.pdfIn PDF document text
    • https://jigudubexafodi.weebly.com/uploads/1/3/0/7/130738940/6781099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5ffdc6563202a.pdfIn PDF document text
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/zedugokipo_wizex_salakowijijux.pdfIn PDF document text
    • https://dumexegutotopu.weebly.com/uploads/1/3/4/3/134354144/7226138.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/KhbhDTG/75310563987.pdfIn PDF document text
    • https://suguturame.weebly.com/uploads/1/3/1/4/131438741/8b0ae3776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368246/normal_600072336ed6d.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/hieMghB/74056361896.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/kawotexulozax/lebos.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/64448550502.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/54849697155.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/17866605671.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/dajasakexewevi.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/96243280805.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/mafowaxaxe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEED 5728 bytes
SHA-256: 344fc49715c20c16ec172dc31bee0ed2fc7b5e9e6fe4d191356e29f10ebaab7e
font_01_sfnt_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 10304 bytes
SHA-256: 904f59400e1d0cab6189e76dbb4d79cc36720721acd6411fb22d3eeaa8ce50d5

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