Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdae010dc4eebde…

MALICIOUS

PDF

73.1 KB Created: 2021-04-02 04:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b429f419db2a2dd7ea463b0fb7ce3c17 SHA-1: fa8722b9e028ddbca0cd24b42a41192d4e2779b5 SHA-256: 1bdae010dc4eebde9febbf66db43fb58ca007c46d42894b14dabe5c1a50005e2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it is likely a phishing trojan.

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://xajibur.ru/strik?utm_term=how+to+address+letter+going+to+ireland+from+us PDF link annotation
    • http://ruxejup.22web.org/advertising_lesson_plan.pdfIn PDF document text
    • https://fatanavaxiwakat.weebly.com/uploads/1/3/4/6/134606547/zusutelopi.pdfIn PDF document text
    • http://seseletozub.iblogger.org/sidogudovuwelulam.pdfIn PDF document text
    • http://zijezokoriwe.iblogger.org/advanced_java_concepts_with_examples.pdfIn PDF document text
    • http://forkidsshop.online/bopumafuselesasaa6dw4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5fc6adab7fb15.pdfIn PDF document text
    • http://ramavevukomiw.iblogger.org/58153972352.pdfIn PDF document text
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/zufinotagawafanira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_603e0f340fa65.pdfIn PDF document text
    • http://tidexozi.22web.org/biacore_insight_evaluation_software_user_manual.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/lefuneranodevel-dokurikuferip.pdfIn PDF document text
    • http://okclub.org/43317696060379z1.pdfIn PDF document text
    • http://trysoda.pro/hp_officejet_j4680c_wireless_setupiiz0s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xatowumo.epizy.com/gawosunowuxijutijetirom.pdfIn PDF document text
    • http://befakas.epizy.com/tojanujalolezomewigasuwaf.pdfIn PDF document text
    • http://wagesasalep.rf.gd/mesapiguradipejadevob.pdfIn PDF document text
    • http://vupikefugogulup.epizy.com/35054730404.pdfIn PDF document text
    • http://jajuzefob.rf.gd/xadobatax.pdfIn PDF document text
    • http://lipesomidu.epizy.com/bazaar_film_all_songs.pdfIn PDF document text
    • http://tididesonorevo.rf.gd/velonelidebewewuferivasi.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_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 5280 bytes
SHA-256: 01cccb2a53524d2366d9e0f702e8c0dc8c1198dac6ab5e5fa6c55cd2fdfce501
font_01_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 10212 bytes
SHA-256: e4039de11aa7696bc10db44bc424ab50d4ad26db3cf60d605cf2fead50321050

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