Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d3b37c861fa943…

MALICIOUS

PDF

76.6 KB Created: 2021-03-12 16:21:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a49846969048fa0243c679e7acc5a5fd SHA-1: 2855e086ffcb69ab135898e0ccb4c1e93c0be33f SHA-256: b9d3b37c861fa943cb9d74657ec699ff804412f071633ead6ae4f97df43c072a
186 Risk Score

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=significado+de+bivalente+en+informatica PDF link annotation
    • http://armada.technology/740657983903y9tv.pdfIn PDF document text
    • http://bilet-pdd.site/20725220791k31mg.pdfIn PDF document text
    • http://mx50off.pro/workbook_on_harmony_grade_6_answersv0bsd.pdfIn PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/4ce8bb.pdfIn PDF document text
    • http://gufutaca6.xyz/fezenofagufexuginizuxxnvwr.pdfIn PDF document text
    • http://gezoxapawelu.22web.org/81338089449.pdfIn PDF document text
    • http://rfs.team/jitotonerob2c3o5.pdfIn PDF document text
    • http://mediaverifiedbadge.com/82289859634jl8pb.pdfIn PDF document text
    • http://swiss-gear.store/handover_checklist_word_templateyczhz.pdfIn PDF document text
    • https://xaleratugigajij.weebly.com/uploads/1/3/4/6/134631249/3f501a71b.pdfIn PDF document text
    • http://fitness1.space/xejabudarofjfg.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/6215418.pdfIn PDF document text
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/8522d8a01.pdfIn PDF document text
    • https://dususujere.weebly.com/uploads/1/3/6/0/136024938/8133087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovisak/css3_flexbox_guide.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_030b48555d48475dbd3e75ea87e8b97e.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_d263904972084d0dabe293e37cf70175.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/the_lion_the_witch_and_the_wardrobe_original_movies.pdfIn PDF document text
    • http://giratas.epizy.com/admission_form_for_class_11_in_kolkata.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_6cd8d60403474b8c99215acaf99cf6bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/sovosekovorajadubonumu.pdfIn PDF document text
    • http://rinifujojutot.epizy.com/the_things_they_carried_movie_cast_2020.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_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 5468 bytes
SHA-256: 9dddf564871320b72171daa986861a72272603c64547e3228072caeff9c97b93
font_01_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 11840 bytes
SHA-256: 9d2b547dc3acfa24a5bf3765600d68393a6954e4c7e594f0fb1cb6749b161507

Open this report in the interactive analyzer, or submit your own file for analysis.