Malicious PDF — malware analysis report

Static analysis result for SHA-256 386c6b607e24376e…

MALICIOUS

PDF

103.6 KB Created: 2021-05-19 15:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 45cb6ddb8ce26cac8e7e4e12dfe287f1 SHA-1: 1ac6c464a635a6e3e38a6ce6fb52e5c7242006a1 SHA-256: 386c6b607e24376e00b699fff3fa8b8ed3eccf00ab8742c16776f5622e9825b8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or scamming operations. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/strik?utm_term=how+to+unlock+rain+skins+mk11 PDF link annotation
    • https://givebuzuwipagin.weebly.com/uploads/1/3/0/7/130775776/b0bfd7.pdfIn PDF document text
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/1054641.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/422926.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382771/normal_5fc9d78d91053.pdfIn PDF document text
    • https://xetofevona.weebly.com/uploads/1/3/1/3/131379012/xegofulevobunu.pdfIn PDF document text
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/demox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461205/normal_600a16b7c3cd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481272/normal_602ce5a5aa3e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480161/normal_605bcafead4c9.pdfIn PDF document text
    • https://mamumudud.weebly.com/uploads/1/3/0/8/130814078/xuwijoru_xaviladikav_vutelosaw_gugupiz.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/wabalarufugusututa.pdfIn PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/dirafoxatufajitezava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_604864877636b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_60390a6647a3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459479/normal_5ffbac6fc7199.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/1314626.pdfIn PDF document text
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/3103504.pdfIn PDF document text
    • https://wenuzivubog.weebly.com/uploads/1/3/5/3/135392435/16d62daab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486534/normal_605ff2285105f.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/jodabiladezot/sisuvuk.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/97442997053.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/xebamurap.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/xabulax.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F55 5112 bytes
SHA-256: 9cf8d7baee888a7ac867c5e6b5d825824ed2edfd87a14b9ae7c8fe7fc4cd94ff
font_01_sfnt_off000150b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B3 12748 bytes
SHA-256: 9137803772e8e948877f7ebb31a72f149295c61af4699d732ec34e85e06d07a7
font_02_sfnt_off00017ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC8 16316 bytes
SHA-256: bffb1a1f3a6d0b61156f2d340f5ce00831c1e6b46cf0e5a0edccbb6de7acfec3