Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddfa94da3113517…

MALICIOUS

PDF

65.6 KB Created: 2021-04-15 12:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d18e6cdcce05985760ed56a5c51334d1 SHA-1: f38d954ab2de8cfffe9a47624b4e1212e27ce611 SHA-256: fddfa94da3113517c6dcf63deb0db339a662d64add6c7a780bdc926c703f1eb9
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external URLs. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=formato+inspeccion+vehiculo+liviano+y+pesados', which is likely used to deliver a secondary payload or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://resalured.ru/strik?utm_term=formato+inspeccion+vehiculo+liviano+y+pesados PDF link annotation
    • http://getcreditcheck.info/lesco_z_two_zero_turn_mower_parts_diagram1ee39.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/wodizemuruw.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/que_es_un_astrolabio.pdfIn PDF document text
    • http://ellmax-site.xyz/496213816194aomi.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/pride_and_prejudice_novel_with_letters.pdfIn PDF document text
    • http://shopeuro.pro/challenge_movie_hd_video_songqzotu.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/adobe_place_signature_greyed_out.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/analytical_reasoning_books_free_download.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/palevijuj/26513008706.pdfIn PDF document text
    • http://pitigapevede.onlinewebshop.net/cuanto_m2_tiene_un_metro_cuadrado.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/lariroroxorusasomugiwuna.pdfIn PDF document text
    • http://gumomexad.onlinewebshop.net/allen_bradley_heater_chart.pdfIn PDF document text
    • http://pigutun.myartsonline.com/kofup.pdfIn PDF document text
    • http://jupevesu.atwebpages.com/bridge_to_terabithia_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/poulan_chainsaw_fuel_line_repair_kit.pdfIn PDF document text
    • http://pusebirenox.myartsonline.com/perfiles_de_aluminio_catalogo.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_off0000c215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC215 5428 bytes
SHA-256: dfabd874d2f5a3623640b8372194b973261927b2b9495970ed5d96e6d402f596
font_01_sfnt_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 10876 bytes
SHA-256: b09eada274fc825d93c027e96a4bfe317474b6c49fd00fff929511731f009496