Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b8d2e56accff99…

MALICIOUS

PDF

79.4 KB Created: 2021-03-27 13:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 39ffb987aed0c9545038caa83b8959e7 SHA-1: d85c7d356313a37bde7ec1a03c7b08a7e150577f SHA-256: 42b8d2e56accff9923eb148f841a5fe9a074d81a8101837379fd917209d968f1
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. One of the embedded URLs, 'https://kuzutuzo.ru/award?keyword=boolean+operation+in+catia+v5+pdf', is particularly suspicious and likely leads to a phishing or malware distribution site. The PDF structure and the presence of numerous external links suggest an attempt to lure users to malicious content, consistent with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/award?keyword=boolean+operation+in+catia+v5+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494883/normal_60275e3e3f7c5.pdfIn PDF document text
    • http://deemonatrafik.xyz/51327984871zv3ne.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_60196500e096b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404964/normal_6027cf7a14aef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fcbf24d55f66.pdfIn PDF document text
    • http://icily.xyz/marriott_friends_and_family_authorization_formm5q3w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465024/normal_60304f06bc36d.pdfIn PDF document text
    • http://contact-git.top/why_my_mobile_hotspot_is_not_showing_in_other_devicesln2y1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_6026abaca3ef9.pdfIn PDF document text
    • http://appletopshop.ru/rubalofbgxvd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_615978ea27004fda89d683622e4af6fb.pdf?index=trueIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_24dc026f248745ad95cdc2250143a9a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f84dc58-56dd-4f7a-a1d9-0f7587b1ac4d/where_to_watch_big_little_lies_season_1_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6812e0b5-00f1-42fa-b5f3-a394dc1a1382/bonaire_evaporative_cooler_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/vanity_fair_outlet_mall_reading_pa.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_94647a080e97476a983465304d21387e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/rulexowuwubegadizovoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0040d4b7-443b-4ebc-8676-cafc6a14a8c5/widor.pdfIn PDF document text
    • https://ee6e56e8-c390-49d2-810b-d4defef8b9c1.filesusr.com/ugd/eda187_85425c777a154667be1c1595d2b3cbfb.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_c570c7cc1c3e46d2b04fc0e78253a0d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loneminovu/girilesidudizumelupibig.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/90204087726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f346e87-1f9e-4fba-ae61-4b5bf66a57e2/92680740609.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 5204 bytes
SHA-256: 46da0ae760c26b16bcefa2db8a62508aa88d7dee4fcc5f2c630a4ef3ee6e0012
font_01_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 10764 bytes
SHA-256: 161a44745f895bce4749dc92505b1a2b465d412f35e22c861572b81879c73616

Open this report in the interactive analyzer, or submit your own file for analysis.