Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f64da4e00e1206…

MALICIOUS

PDF

68.2 KB Created: 2021-03-18 19:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e35e9356a290d36e6cc7aec01a9b418d SHA-1: 07debc7ce19591b872e5e14e1087815558d2f689 SHA-256: 99f64da4e00e120634a8c695366b55ba5acbee325365c6cb903d05fa6359d19c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a high concentration of links pointing to disposable hosting and employing UTM parameters, indicating a link farm designed to obscure the ultimate destination. The document body is heavily obfuscated and appears to be non-readable content, suggesting it serves as a container for malicious links rather than user-facing information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=abrasive+form+il PDF link annotation
    • https://xuwumiguxapizif.weebly.com/uploads/1/3/0/7/130739656/mepegalipibuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/bjf5uK5/fun_things_to_do_near_philadelphia_airport.pdfIn PDF document text
    • https://woxamaxepid.weebly.com/uploads/1/3/0/7/130776503/7410535.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/ghf5fSy/48497796084.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/what_is_a_social_security_activation_code.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/jeXqjcW/93490299269.pdfIn PDF document text
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/764054.pdfIn PDF document text
    • https://zutuvibob.weebly.com/uploads/1/3/1/4/131407898/2086899e874.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/ihjfJje/invaders_from_android_premium_edition_ps4.pdfIn PDF document text
    • http://adv-workshop.site/8841993368336t01.pdfIn PDF document text
    • http://kemutedetabu.scienceontheweb.net/mudasolupigewixepat.pdfIn PDF document text
    • https://menimewutezosel.weebly.com/uploads/1/3/3/9/133997121/db060c9534e.pdfIn PDF document text
    • http://ptmonline.ru/les_3_mousquetaires_film_francaisdwxsl.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/15302669712.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/ruzaganog/10084489521.pdfIn PDF document text
    • http://susabumo.atwebpages.com/ways_of_the_world_online_textbook_strayer.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/falapojojaxudukirilupufot.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/how_to_change_wick_on_aladdin_kerosene_heater.pdfIn PDF document text
    • http://womawujun.atwebpages.com/36086632088.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/which_meteor_is_heading_for_earth_2020.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/diamond_aircraft_maintenance_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 5104 bytes
SHA-256: 33a6af57c2a3e71ea2000cf3e6c6cf2257e76a15823c2826e718dda95a5274bc
font_01_sfnt_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 10560 bytes
SHA-256: a151c9cac473abed14d698dfde1ddcab0c78e92d66993293f743dd76a5a4e82a

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