Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3499d421833687b…

MALICIOUS

PDF

85.3 KB Created: 2021-03-17 12:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5f3a18b78468078c6572910842c1c4cf SHA-1: 113e54734d93cb6081dea2fc8b2890edcff09a3c SHA-256: a3499d421833687b7f1099b0824bacc5644f13aea09f6e81293f5e5bc73cebd5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful websites.

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://zajinet.ru/wix?keyword=ramadan+2020+end PDF link annotation
    • http://niwopofe.scienceontheweb.net/54646680364.pdfIn PDF document text
    • https://torufiwatus.weebly.com/uploads/1/3/5/3/135312416/4d9eb.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/sosekamexo-gudojul-gefosuw.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/bissell_power_steamer_heavy_duty_3-in-1_manual.pdfIn PDF document text
    • http://vuxilenusip.mypressonline.com/72740899070.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jadizugexagosor.rf.gd/antioxidantes_sintticos_e_naturais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3eec93-1c98-4294-9b03-1ae91889d487/96823450025.pdfIn PDF document text
    • http://lojiwifi.epizy.com/debezuxelevarinaviwer.pdfIn PDF document text
    • http://zetitovafe.rf.gd/spreadsheet_google_functions.pdfIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/treatment_of_brucellosis_in_cattle.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/quimica_organica_john_mcmurry_8_edicion_descargar_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/xutepevovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf1bd0d-b155-4130-a93b-0da8d2ef6202/salter_kitchen_scales_1021_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/hp_laserjet_pro_m402dne_spec_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb1f44d-9520-4f5f-a7f7-ef11eadb1556/how_to_fix_dvd_player_not_turning_on.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/how_to_practice_for_dmv_permit_test.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 4944 bytes
SHA-256: ec99cb009ab02f6a7dcbb4218c2998f5582b14f26aa7f12969fdeed0b5e4e53f
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 23028 bytes
SHA-256: d48bc3bae7594b6503541db8bb42bd00cdbe7c3192196a8dd8d0d5f09a89bf28
font_02_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 16596 bytes
SHA-256: 33e99da21c8720609a9ba9b810f867fd81b8612f854fbb9f04205be658a92123

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