Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df0da60896c3d0d…

MALICIOUS

PDF

83.3 KB Created: 2021-03-29 01:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 33e6e10313dce4853a422fca31a01c3c SHA-1: 003aaebbfd8bf4db6d0b5d13882103aeb12cd70b SHA-256: 6df0da60896c3d0d79db106a339ba30d4972fb183de3620cfd1fed5d139588d6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by multiple heuristics including ClamAV and an ML classifier as malicious. The document body, though partially corrupted, suggests a lure related to 'Spanish preterite tense practice worksheets', which is likely a pretext to drive users to the malicious URLs. The presence of external URIs and link farm characteristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://dugedepap.ru/aws?utm_term=spanish+preterite+tense+practice+worksheets PDF link annotation
    • http://susekilimu.medianewsonline.com/20645949471.pdfIn PDF document text
    • http://mezazasakejel.iblogger.org/academia_vampirilor_vol_2.pdfIn PDF document text
    • http://xinufajororedud.iblogger.org/50736118113.pdfIn PDF document text
    • http://blablablacar.online/descargar_el_juego_de_la_viboritajhs3o.pdfIn PDF document text
    • http://letxxnx.org/mcgraw_hill_ap_world_history_online_textbookq569z.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/how_to_create_awareness_of_human_trafficking.pdfIn PDF document text
    • https://vofesoxofibebup.weebly.com/uploads/1/3/4/9/134900141/mexirexolax_xirogepatijirut.pdfIn PDF document text
    • https://wutekeli.weebly.com/uploads/1/3/1/3/131379380/pigowexa-sarefi.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/pokemon_y_walkthrough_serebii.pdfIn PDF document text
    • http://zafenoro.scienceontheweb.net/50324124466.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/timedowesixixo.pdfIn PDF document text
    • http://salopkisa.website/how_to_change_needle_on_brother_lock_1034d5v2gt.pdfIn PDF document text
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/2732013.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/80757575289.pdfIn PDF document text
    • https://likunemotiro.weebly.com/uploads/1/3/5/2/135299998/4523721.pdfIn PDF document text
    • https://tivelagazevuw.weebly.com/uploads/1/3/4/1/134131505/wirofin.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/how_to_get_netflix_on_sony_blu_ray_player.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/seven_functions_of_language.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/85063020250.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://telosizaba.onlinewebshop.net/xusojutonatoja.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/vsepr_molecular_geometry_worksheet_answers.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/39078932382.pdfIn PDF document text
    • http://xivajaraseb.rf.gd/67803389809.pdfIn PDF document text
    • http://fonenutekosut.epizy.com/gupuwifawa.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/problemas_angulo_de_elevacion_y_depresion.pdfIn PDF document text
    • http://gebejofokim.rf.gd/certbot_windows_manual.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_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 5248 bytes
SHA-256: 9704b4e903bd673f100bb7d7ad8a80641d3d600ba5c52a2e51a8de8484a0b4dc
font_01_sfnt_off00010dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 12420 bytes
SHA-256: b50dd9871bde55cb2f25194125143ccd68865f3c9d6a2295a961b1625272fb27