Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b16f9ff3bc473c9…

MALICIOUS

PDF

79.0 KB Created: 2021-05-03 20:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aa0624818bacd5f75a85e76b04e8346d SHA-1: eaa2f520b8794cd437d3fb82465c292b6ec7b2f5 SHA-256: 0b16f9ff3bc473c98611279a24f1c5d6ea64af21decba2974c0a1a834b7da73b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/strik?utm_term=what%2527s+in+taco+bell+party+pack PDF link annotation
    • http://rowowesofazov.medianewsonline.com/paper_folding_and_cutting_reasoning_tricks.pdfIn PDF document text
    • http://kusufuxufatup.getenjoyment.net/57273399338.pdfIn PDF document text
    • http://wedurorokim.mypressonline.com/61473418510.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/what_is_the_poem_casey_at_the_bat_about.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/can_i_use_a_bluetooth_keyboard_with_my_samsung_galaxy_tab_10.1.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/11712168441.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/vuwedekekave.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/exerccios_tabela_peridica_9o_ano.pdfIn PDF document text
    • http://cparta.moscow/basoxajotodakuleje3g3ye.pdfIn PDF document text
    • http://adv-workshop.site/tizes496u2.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/diffusion_of_innovations_5th_edition_doiuffzj.pdfIn PDF document text
    • http://sowopedasozax.22web.org/ernobil_dizisi_hangi_platformda.pdfIn PDF document text
    • http://vaxenovutejuzid.sportsontheweb.net/cidco_lottery_result_kharghar_ews.pdfIn PDF document text
    • http://rabiwitijif.medianewsonline.com/4150400875.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/62967331391.pdfIn PDF document text
    • http://zoxejusozowevo.iblogger.org/capacity_management_itil.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://xijodakofifo.epizy.com/84404987344.pdfIn PDF document text
    • http://vogapodidojuguf.myartsonline.com/befajufumusurexevup.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/malijedegozekomokogilos.pdfIn PDF document text
    • http://lafagelupuf.myartsonline.com/deriv.pdfIn PDF document text
    • http://lonesopuw.onlinewebshop.net/lutudarateri.pdfIn PDF document text
    • http://dufobirufo.atwebpages.com/68627451163.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_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 5160 bytes
SHA-256: eebdca37c967b16772deefbf4c708fb289e663743b57205361785e8fb69c5205
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 11336 bytes
SHA-256: 1403348a124a3c073272bbc559e1504fd52ff2866e4419958664ae9a84bfca0d
font_02_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71