Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a98781a2269bfa0…

MALICIOUS

PDF

116.4 KB Created: 2021-03-09 12:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1a2464272ccd5ddc416e422b61498fc5 SHA-1: 2102a280ef536aeec507aca08424ac006c7c7e9f SHA-256: 8a98781a2269bfa0b4256eb4fe0198993eabd3187ad566faa9f73ae498611c0b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a constitution document, which is then used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=constitucion+politica+de+los+estados+unidos+mexicanos+de+1824+pdf PDF link annotation
    • http://livethailand.fun/17001092226hhmq3.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/gexMkfP/escape_impossible_revenge_level_1.pdfIn PDF document text
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/bebifi.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/cNjN28t/thor_ragnarok_characters.pdfIn PDF document text
    • http://50offshop.pro/49662997013sdq56.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/how_to_make_a_thermal_imaging_camera.pdfIn PDF document text
    • http://talemine.getenjoyment.net/what_is_the_fuel_oil_mixture_for_a_chainsaw.pdfIn PDF document text
    • http://oneitshop.pro/fafubidanuxevujozeagnca.pdfIn PDF document text
    • http://triple-doska3.club/can_bluetooth_headphones_connect_to_hp_laptopiwsby.pdfIn PDF document text
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/3042660.pdfIn PDF document text
    • https://fajesafopumusid.weebly.com/uploads/1/3/1/8/131871419/zarazes.pdfIn PDF document text
    • http://xanejog.medianewsonline.com/74341835420.pdfIn PDF document text
    • https://cdn.sqhk.co/janezewufaj/gZhahdA/kavikalibudizoturuboka.pdfIn PDF document text
    • http://cardioactiveitalia.site/rufepiliwukofepexe94f.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/TidheMR/vr_games_play_store.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/ho_chi_minh_city_visitors_guidelftve.pdfIn PDF document text
    • https://vomodubezu.weebly.com/uploads/1/3/5/3/135398809/bdc14addb.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/age_regression_comicshsykg.pdfIn PDF document text
    • http://notdull-eng.online/fifepu6vmsj.pdfIn PDF document text
    • http://repair-planshetov.ru/538636358859rcbp.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/ZV2ZChd/diablo_immortal_news.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/pezofut/84995282642.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/chain_png_image.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/wadepilugazu.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/nys_drivers_licence_renewal_form.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_off000187c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C7 5644 bytes
SHA-256: e5fe90a720e98f71904050f56ace220f1d3de4368bba507357bd297c13e8b874
font_01_sfnt_off00019b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B06 11876 bytes
SHA-256: 2b4aed7762491caf13438a14a5e31d72efc37c2676b6c2a084080f3739e10126

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