Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0392b45c63d430b…

MALICIOUS

PDF

85.2 KB Created: 2021-03-25 22:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8305fe0c6dd3456b6d0f05534e82f26a SHA-1: cf6a27a158013df959a8faa284ad65d7d7bd12c6 SHA-256: e0392b45c63d430b95abf0b05116d3be6b190a9e456475869040e71c9feaada3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The primary attack pattern involves directing users to a large number of URLs, likely for SEO manipulation or to serve malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=lattice+energy+practice+problems+with+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485589/normal_60538d9dd50c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_6022bab37fbdb.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/nemos_fuzanixi.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/zilagelexif.pdfIn PDF document text
    • https://gasovopur.weebly.com/uploads/1/3/1/4/131453365/manigo.pdfIn PDF document text
    • http://mudikovarew.mygamesonline.org/jarolavavigulaparol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fidajakafitota.epizy.com/what_is_the_theme_of_billy_elliot.pdfIn PDF document text
    • http://korudowewufo.epizy.com/jevive.pdfIn PDF document text
    • http://watijosanowo.epizy.com/45799887286.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/angina_pectoris_articles.pdfIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_84d6bd422dfb408c9cccb3bfe8ccbc0b.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_e639ff6934d348aeae57e63dea5b3786.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_b06b7b794ce24dcfac41e9f264dfb288.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_b4fb043d7d1845968ed88c80dfb47050.pdf?index=trueIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_4e349e4294f64b50b91a3109c295c8aa.pdf?index=trueIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/whats_the_difference_between_pass_by_reference_and_pointers.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/what_layer_does_vpn_use.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 5844 bytes
SHA-256: 541c2ac4e8d84db44ad385c9f1477a2adc31f28d5fd36b83e55298d417748ad3
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 11736 bytes
SHA-256: 4523c0e2b7f72d76beb058eb04addac6560b6691d2dac135d63ff8823bf14819
font_02_sfnt_off0001306e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306E 16080 bytes
SHA-256: 3d50f22d3ae6d9a4461c814f81554cc573a3512c555c2f223aedeeaca19cd658

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