Malicious PDF — malware analysis report

Static analysis result for SHA-256 2574eb0abfc2b6a8…

MALICIOUS

PDF

83.0 KB Created: 2021-05-16 00:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 77d3d581395834c6bf54ce3ca74ef5d7 SHA-1: 8fc4130e9e810e7a9497f43e2c9d6833ac107fb1 SHA-256: 2574eb0abfc2b6a8a38e2d1f4f9c6ab931d1bfa97cc01243ed5e91a11f7daa8e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://botokaw.ru/strik?utm_term=when+did+the+moto+g6+come+out PDF link annotation
    • https://cdn.sqhk.co/mojerakikav/2hczhiv/kazubatudoranilovuv.pdfIn PDF document text
    • https://cdn.sqhk.co/livejizilul/fiehgig/expense_form_template_for_small_business.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/dCib7kI/lawuvogit.pdfIn PDF document text
    • https://ritewelikuwu.weebly.com/uploads/1/3/4/4/134493798/9626445.pdfIn PDF document text
    • https://cdn.sqhk.co/perukinabe/2NvijOz/topajedukukugepatalulo.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/pibuvokupegije-muzinugu-retuwu-kisaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_60155bb03395d.pdfIn PDF document text
    • https://lozexisivebuzon.weebly.com/uploads/1/3/4/7/134702594/4974192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419003/normal_600c8df3cf4c0.pdfIn PDF document text
    • https://ponatuxo.weebly.com/uploads/1/3/4/5/134596183/nululifikuvewij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_6022c55571bf4.pdfIn PDF document text
    • https://cdn.sqhk.co/duziketopefi/diSicCQ/nintendo_switch_online_cost_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_5ffc2b1601f22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mimodiko.epizy.com/adverbs_of_intensity_worksheet_grade_6.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_bd1a348f477c4cb4bcf0eda333e70d62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/pibazunafexosovigezo.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/daily_news_bettors_guide_week_5.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_5686598537d048578b8254e49c244cbd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajezife/boeing_747-_100_flight_manual.pdfIn PDF document text
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_8bb00f251cd2446c956c05b2f5a5b562.pdf?index=trueIn PDF document text
    • http://rilerulijomowam.rf.gd/gewoti.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/best_blogspot_templates_2019.pdfIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_ab62956d9ce540bd908cd4c2297aa8d8.pdf?index=trueIn 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_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 5004 bytes
SHA-256: b879822ee5395e02451996853a324f0bb4c589ae32dbd797ab5f78201bfdcbc2
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 13496 bytes
SHA-256: a3e8d8b8dc2cbe5724f29ae7da1ce3e9c94da0815e97a8ea570c3d6f19100018
font_02_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 16184 bytes
SHA-256: f0dab19486809e516fe56850b7b046ffaa305fd205921d59208d887e813e51d9