Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10988c1f49f90c6…

MALICIOUS

PDF

71.2 KB Created: 2021-05-31 00:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 862726a4a3e9d6de51b6a334358c3830 SHA-1: 13acb3fde4c6dd8127a931a0d19675a358ba671d SHA-256: d10988c1f49f90c68fe4ea62b2fa6b2081d54cd3ac4f9fd8726da7e30c671371
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=biolog%25C3%25ADa+y+geolog%25C3%25ADa+3+eso+sm+solucionario+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447888/normal_603b21af41a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_5fe6cbdae82e2.pdfIn PDF document text
    • https://dujedagopodiku.weebly.com/uploads/1/3/4/5/134580966/lapibif-tumaxobaso-dumemezuj-noxinabusabamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_604d79149a012.pdfIn PDF document text
    • https://mopabofigovusig.weebly.com/uploads/1/3/5/3/135319119/0cb37fc6f4.pdfIn PDF document text
    • https://vipizavubo.weebly.com/uploads/1/3/1/4/131407691/badom-xutefexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_605aebe6e4570.pdfIn PDF document text
    • https://keminugugenoxag.weebly.com/uploads/1/3/4/3/134321568/zorikipemelopetometo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414357/normal_5fdb1444e95d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405930/normal_6002ee9b04aef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413585/normal_5fff7857bb0ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_605c06dd0d5f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_60696476d377b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444098/normal_60511a1c49f01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419236/normal_5fe1683e525eb.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/2cad419b-4278-43a5-b95a-a8cccce871bd/kuliposemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3786fcc-7411-411b-91e8-dccf304af39c/significado_de_la_palabra_cosmologia_diccionario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac474ea-8df1-400f-8032-76bde7d0c5c1/zuvuxitonipenexinalasumow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f627b1b0-ad5d-4afe-8f0a-b37f7afa1cc5/90095313842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6a8f6c-eb3e-4c06-8f4f-a0c60a822fcd/what_is_news.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369b7546-09ee-4e50-bd59-f64690d5bf0c/vikapozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14bff91a-6b78-4681-890d-ce27a09de9ad/vizipivevolepawux.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_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 5844 bytes
SHA-256: 14051a8fb6ba89f971caa2c6c0532cb2404de1189fdcc51e851790b8f640e56d
font_01_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 12072 bytes
SHA-256: 31978b39cdda7b8dad9a65703777f6a5b969f46a2147fea1ab1821516df199b8

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