Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a81ab1dbbc378de…

MALICIOUS

PDF

76.0 KB Created: 2021-03-03 12:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 79ed5b7c788f7d5a8f76abab83b77906 SHA-1: 4705ebf92a610ea27834df2f487e82ed294a48f8 SHA-256: 2a81ab1dbbc378dec1cab70543fafad19b3efd3f2446e232ae5336c58407331c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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/wix?keyword=hollow+knight+randomizer+tracker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455374/normal_60229f864431b.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/aMgeeNm/jaguar_movie_bgm_ringtones_download_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/FIhfMgd/copper_price_chart_5_years.pdfIn PDF document text
    • http://sudejiw.22web.org/chapati_pandu_song.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/80885566344.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/samsung_wf42h5200ap_a2_filter_cleaning.pdfIn PDF document text
    • http://eurozone.pro/assistant_director_of_nursing_salary_long_term_carenxf13.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/finisiwisitebetuvazavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_600a4fbf94739.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/gghjMii/fukugejatizivuzosana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460457/normal_5fec797b540e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vefodipox.myartsonline.com/separation_process_principles_download.pdfIn PDF document text
    • http://zamonile.epizy.com/akshay_kumar_song.pdfIn PDF document text
    • http://dopovis.myartsonline.com/what_are_the_dimensions_of_a_langstroth_frame.pdfIn PDF document text
    • http://vegigekud.epizy.com/buddhist_boy_names_in_marathi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 5128 bytes
SHA-256: 5495eaa6796f789338c57d85ec2d1568eeee77a2d8b45df9d8113cec6d170be7
font_01_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 10808 bytes
SHA-256: d0120208a6a7132392c9fff7cd18e27ca3429fe9d705e73b8b2907811d630605
font_02_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361