Malicious PDF — malware analysis report

Static analysis result for SHA-256 b621822ae4d80ad6…

MALICIOUS

PDF

87.8 KB Created: 2021-03-12 19:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e468a8bb1537075e11555923832efb87 SHA-1: eb65b17732c26501cb09740172be0e74e24f6db1 SHA-256: b621822ae4d80ad657b39cb306d25f47bfc42904f79bb86fc033d9e1af069f88
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URL `https://jacksth.ru/strik?utm_term=can%2527t+connect+to+xiaomi+wifi+repeater` suggests a phishing or scam attempt, likely related to technical support lures given the URL's query parameter. The presence of numerous other unknown URLs further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jacksth.ru/strik?utm_term=can%2527t+connect+to+xiaomi+wifi+repeater PDF link annotation
    • http://hookup754.fun/durchschnittliche_nderungsrate_aufgabenulysf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_600c9c184de2f.pdfIn PDF document text
    • http://storeyou.store/chemistry_addison_wesley_5th_editionq99yq.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/ibejeij/wexakajafanenuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_6033c5930a7b5.pdfIn PDF document text
    • http://delunabiwefepef.22web.org/94637616295.pdfIn PDF document text
    • http://tonagruz.ru/how_to_create_sales_targets5ggle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447252/normal_602a9f7be98b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_6036bb02782f0.pdfIn PDF document text
    • https://cdn.sqhk.co/nezipumosot/kYibid2/sports_apparel_stores.pdfIn PDF document text
    • http://vanlit.ru/30041111849ss5zy.pdfIn PDF document text
    • http://bhd-management.space/palafarovumixopatemiyo5i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_0e1c319e5c3e4bdd8ad1e63e20a38f1a.pdf?index=trueIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_6064cafc51bb408e8d9bcd1cef0d7fab.pdf?index=trueIn PDF document text
    • http://gidiletejeke.epizy.com/tudawolexametazexipesula.pdfIn PDF document text
    • http://xovanesoku.epizy.com/biology_textbook_9th_grade.pdfIn PDF document text
    • http://fujexadegog.rf.gd/kazomifokodiwimugi.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_d928400b4d234ec38fa14bb3693558e5.pdf?index=trueIn 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_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 5052 bytes
SHA-256: 91710a508d0855f83f517e2c44174ca6abbd0f35c7b6f84cc73e783f2309445d
font_01_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 12412 bytes
SHA-256: 52d253ab0bb767715792f6e0ad86d79494301ff962986693cb4dca9baacc476f
font_02_sfnt_off00013cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC7 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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