Malicious PDF — malware analysis report

Static analysis result for SHA-256 666b2a65ad86ee6e…

MALICIOUS

PDF

78.8 KB Created: 2021-04-29 21:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e577bb3853eaf8ca98e93dd671b2c4db SHA-1: ba880cfc2ae37e59e3273ac48f7b3ee86219cc02 SHA-256: 666b2a65ad86ee6edf806683171b7f4a8750706ce294bd3b7684ac098ff32fb9
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on disposable hosting. The embedded URLs, particularly the one pointing to 'bologen.ru', suggest a redirection to potentially malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to host or link to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=little+prince+book+meaning PDF link annotation
    • http://xuxoromozura.iblogger.org/14693859878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_602800ddb6955.pdfIn PDF document text
    • http://mipedinujit.22web.org/farming_simulator_15_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/jdgeIhb/sun_prepaid_promos_surf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475999/normal_605b9288b64d4.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/hGlgimg/jejamikutaxulabaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5fd067ca9036e.pdfIn PDF document text
    • http://seritepaxuv.22web.org/burda_patronen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418796/normal_604719a9bab74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kevefadewa.epizy.com/1607261034.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_bb97301f8c5547ecbe940f0d8f84ec35.pdf?index=trueIn PDF document text
    • http://lamuverifob.epizy.com/23589301184.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_5251c8558de943e78d5677d64104116e.pdf?index=trueIn PDF document text
    • http://gogedejejap.rf.gd/accounting_equation_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cadd5db-f1d4-486c-8515-16544841be64/8273736558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0828beb5-39f1-4bc4-a21e-fc3fa8163cbf/wupojupewe.pdfIn PDF document text
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_508954a207ae4229824e4910f162ac69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c1c062-f336-414e-a421-ca2a29f8648b/adt_safewatch_pro_3000_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df15345-e2e1-41c1-b9f4-78a90a4bcb85/jirabasofajadujuze.pdfIn PDF document text
    • http://dofarofiberik.rf.gd/alkane_reactions_worksheet_with_answers.pdfIn PDF document text
    • http://ditajizuru.rf.gd/jidukeronisu.pdfIn PDF document text
    • https://9c8f49e5-5895-4656-bc53-c560b1a0ede3.filesusr.com/ugd/0f7a6f_d124b0ee1f0443b5a049158b2381e1c7.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 5220 bytes
SHA-256: 168ebb63f7fcff8aad3b9843ef14c5adbf89e58e09db6e5dd985e34185289ddb
font_01_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 11332 bytes
SHA-256: 262a833a7ca1cc8a8687f1dd8280810663a3609b71e13ae42728dc3ce63368f4

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