Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e55a856531dd8d3…

MALICIOUS

PDF

84.1 KB Created: 2021-03-13 17:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f2ed6fda395e485914b90a43f16a2223 SHA-1: 99df903b448f137a0d59ed91391e7f33cfcc5698 SHA-256: 2e55a856531dd8d30bdf4aa99821a3988a12395b55101c266317ef035054ba05
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. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple disposable hosting sites. The embedded URL points to a site that appears to be a redirector, likely for phishing or malware distribution, and the document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'full metal jacket monologue script', potentially as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=full+metal+jacket+monologue+script PDF link annotation
    • https://cdn.sqhk.co/gigatakel/Sjh6Phg/85007492058.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/what_is_the_rarest_nascar_diecast.pdfIn PDF document text
    • https://cdn.sqhk.co/govulasem/eYhfcjh/52631064484.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/hbigGvu/knife_sharpener_electric_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/XtwcQz3/bethesda_circulator_holiday_schedule.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/samuel_beckett_bridge_rotation.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/cigKLxR/free_italian_music_ringtones_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/eKNgjVR/patch_for_smart_launcher_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/cgeCljd/67803079511.pdfIn PDF document text
    • http://snegny.com/what_is_media_convergence_simple_definition6he88.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/exemple_attestation_de_prise_en_charge_visa_touriste.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/toro_weed_eater_parts_amazon.pdfIn PDF document text
    • http://idealicaitalia-official.site/how_to_set_fleck_water_softener5wkf4.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/jbjhcjb/battleground_s_survivor_battle_royale_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/jcSggJm/skin_editor_for_minecraft_pe_custom_skin_creator.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/telasebisu/50672116834.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/data_analytics_and_reporting_manager_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/jaxukebalexogogopon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea84289-1ef7-4c4a-b227-4f4c3daacc45/difegonosudijenomedomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a87ad80-eb90-42db-982e-351d293e9a6d/what_is_a_therapeutic_foster_home.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_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 5348 bytes
SHA-256: f3cdf07238ea97fdb8b8d8d50ea86bb6be4956327ec4f7abe07c09a26bad565f
font_01_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 10684 bytes
SHA-256: abab7ebaa912ef92148f900f007368ee18432a79739ae8190ed3854c558c1aa7

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