Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cebd092e4e938f8…

MALICIOUS

PDF

73.7 KB Created: 2021-03-20 04:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 940aab50575bebe66e9af12765185b50 SHA-1: 33ab70d4c32fe971f2f355a0240ae8f26fcee5ba SHA-256: 4cebd092e4e938f8d51baeb502c059ec60c40e3113d4947b7d4ee866659f6511
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://crophysi.ru/strik?utm_term=relative+clauses+exercise+1 PDF link annotation
    • http://copyrightmediahelp.com/pevoxiz1pdr8.pdfIn PDF document text
    • http://lifeshop.pro/85759498691jrqj2.pdfIn PDF document text
    • http://stroy-level.ru/91786157204hivgn.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/ahsan_ul_hidaya_freez487x.pdfIn PDF document text
    • http://sadanojigoma.22web.org/webkinz_jelly_bean_challenge_guide.pdfIn PDF document text
    • http://favosiwuvaru.iblogger.org/kidofiwurin.pdfIn PDF document text
    • http://natlab.ru/77622493703k0oa5.pdfIn PDF document text
    • http://lbaranaydin.com/44036572969zi3k2.pdfIn PDF document text
    • http://the-job.ru/20177566349n73e0.pdfIn PDF document text
    • http://kreativoblako.com/handsome_jack_costume_guidehntfs.pdfIn PDF document text
    • http://dashcamtopbest.com/rutijod16ys.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_ee761ddb9029418283b23a3431f132ad.pdf?index=trueIn PDF document text
    • http://borufaf.rf.gd/aprendizajes_clave_educacion_fisica_educacion_basica.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/sosageluzofexipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf93bff-c67f-4522-81e6-2980d5f5ce09/how_to_openline_zte_pocket_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e711f8c-e14c-498f-9996-8c964d0e4e9a/the_encyclopedia_of_country_living_book.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_34f255b2174943159367351ed435a234.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_f3ae1d35dbed4607bd0e49bd21527277.pdf?index=trueIn PDF document text
    • http://kipazafar.atwebpages.com/ap_grama_sachivalayam_exam_syllabus.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_c349946a7d114393be80e0933cd75643.pdf?index=trueIn PDF document text
    • http://gureragiwoxoseg.epizy.com/nosijevagumodinapow.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_83ccf92e09cf4c86b127043c4a9e1bdd.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_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 4980 bytes
SHA-256: 24c50bd5a8a6e4948122886903603a7f78abdc9ba440e3639739a448e30a6a90
font_01_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 9644 bytes
SHA-256: d5a92dec79268722c7ca90758753333594fbe972c5884fd34186cb4e0d5069a4

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