Malicious PDF — malware analysis report

Static analysis result for SHA-256 16673b21ef608778…

MALICIOUS

PDF

70.4 KB Created: 2021-03-23 14:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b87a8b372dd9d9258f565d830008e475 SHA-1: eee5620e0c98e000cddf87b3369a7723a53d974a SHA-256: 16673b21ef608778c793088d8f335dd378629f1870bf6bf7e3931996e2346ce4
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or redirection attack pattern.

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://botokaw.ru/strik?utm_term=adele+-+someone+like+you+%2528acoustic+guitar+karaoke+backing+track%2529 PDF link annotation
    • http://es50off.pro/vexuraj4cc9p.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/helicopter_mechanic_jobs_near_me.pdfIn PDF document text
    • http://mebelintera.ru/resiriperozimexohravq.pdfIn PDF document text
    • http://vitogap.22web.org/komposisi_nutrisi_hidroponik.pdfIn PDF document text
    • http://dommasters.site/how_to_fix_a_scooter_battery_that_wont_chargek0xyi.pdfIn PDF document text
    • http://my-favshopc.online/pagevowazusizof76caw.pdfIn PDF document text
    • http://unonatur.space/58872097176408rb.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/intermatic_st01_3-way_timer_switch.pdfIn PDF document text
    • http://piredvizhnik.com/corner_of_the_sky_sheet_music_freeglqee.pdfIn PDF document text
    • http://kernig.online/32746652907jmvik.pdfIn PDF document text
    • http://nusezuretoti.scienceontheweb.net/career_path_finance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memamawu.onlinewebshop.net/band_pass_filter_circuit.pdfIn PDF document text
    • http://fujunaxukipasin.rf.gd/ibm_i2_analyst_s_notebook.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/personal_guarantee_loan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/informasi_blk_bengkulu.pdfIn PDF document text
    • http://zefexulipovi.rf.gd/7401210233.pdfIn PDF document text
    • http://koxigumom.onlinewebshop.net/analise_tecnica_e_fundamentalista.pdfIn PDF document text
    • http://zerufemebokuv.rf.gd/pathfinder_chosen_one_guide.pdfIn PDF document text
    • http://xejarejunap.rf.gd/wonotudotekitam.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/accretion_disc_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/lusere.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 5740 bytes
SHA-256: 2be14e89b595d5db173fb70b68497c9573812cbe5f606ee717d98e9d6b7d43e8
font_01_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 10312 bytes
SHA-256: c57ee840580627d6aa537c4d3a76d9a185f09af88ab69aa19f4ce90981efd191

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