Malicious PDF — malware analysis report

Static analysis result for SHA-256 181cbebaa04945e9…

MALICIOUS

PDF

74.4 KB Created: 2020-11-13 14:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e45afd278c207681318b4065b503993d SHA-1: d4ca40daac2932831144f6913f5bbfe0a1cc4a9b SHA-256: 181cbebaa04945e9c7d52a183e1d934be5503d011289de462e8ecb6035e31565
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-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://trafffi.ru/strik?utm_term=analisi+logica+pdf+scuola+primaria PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408991/normal_5f9af4b790904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_5faac3493625a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_5f8aee2507919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f8b4d8e8be46.pdfIn PDF document text
    • https://wizejuxexena.weebly.com/uploads/1/3/4/6/134655833/gakisetupej.pdfIn PDF document text
    • https://tirigimufaregi.weebly.com/uploads/1/3/4/4/134464067/5078756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f9f9ad1ad357.pdfIn PDF document text
    • https://koxarakofawel.weebly.com/uploads/1/3/4/3/134310925/gofulow_pekoribokavog_vuvakalasude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5fa6ce86025d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f8b099f7faa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5f8bed17553b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5f9275153987d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f98df10b6ba7.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/4bb943ea-92c1-4117-b057-1b7eb0a3622f/pelub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc21900-88a6-445a-823e-06f6dc89e443/luvaxe.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_off0000d053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 5464 bytes
SHA-256: 82203e1dd955859da370cf2f1ec4bba6394dc6f39ba990a9689ae12faa61e95c
font_01_sfnt_off0000e2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DB 11312 bytes
SHA-256: 704cb57931fd130f3ca1258771a5936b8181eef400380f55b6851f386b10afca
font_02_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 16096 bytes
SHA-256: 292b67320f20e7e38814323bff47001ccb55b5eebb397aea8a254f3e91f57b87

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