Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e4c3080a81abd7…

MALICIOUS

PDF

73.2 KB Created: 2021-04-25 23:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c6adc45dc5ba339cdf7a4ba8b59086c9 SHA-1: bb3d68714631a64cdc09dbd6ab879bbcc978fb98 SHA-256: e5e4c3080a81abd71d3ee8cd0d2e0569fed03cfef27d84a619daa3cefeb942dc
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 0.9997

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://xezojetit.ru/strik?utm_term=how+to+all+reset+citizen+eco+drive+watch PDF link annotation
    • http://reduslim-eu.site/zumakifojolujeiqe5g.pdfIn PDF document text
    • http://motivawka.online/manufacturing_engineering_handbookt9f53.pdfIn PDF document text
    • http://setlyb.online/construction_management_fundamentals_2nd_edition2tegx.pdfIn PDF document text
    • https://wofugegiperezaj.weebly.com/uploads/1/3/4/5/134528457/katod.pdfIn PDF document text
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/651590.pdfIn PDF document text
    • https://pojikajuruwasi.weebly.com/uploads/1/3/2/6/132695468/ea5e4b795.pdfIn PDF document text
    • https://paxupodef.weebly.com/uploads/1/3/4/7/134763896/92a62b0ee7e9.pdfIn PDF document text
    • http://lnstagramsecurity.net/balanceamento_das_equaes_quimicas28cvv.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/lopadivupudexa/sarazodel.pdfIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_060bea71c5214b0a95abc6908324c043.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remeranexe/ron_paulk_compact_workbench_plans.pdfIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_69fc991a3dd5445883b79cd6644d7856.pdf?index=trueIn PDF document text
    • http://totenudiwuwodu.epizy.com/advantages_of_educational_technology.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/informasi_obat_prenamia.pdfIn PDF document text
    • http://surufutikexa.epizy.com/58771844362.pdfIn PDF document text
    • http://pokazirajig.rf.gd/jeteb.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/46934236400.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_b0b38b204a684c77b45b8127d18f044e.pdf?index=trueIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_621bde01c0cc48ebb56e9cb2f45f4bcd.pdf?index=trueIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_c0fe510573994f36a5285ab1e0862c07.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_2c805cdc600b488ba296b8cb7358eb83.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 5192 bytes
SHA-256: e4eeb4fabbb2eb0e2fa7a9af7588ab1bb31b6bf5e44e88d1986c96b1af0dc190
font_01_sfnt_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 11320 bytes
SHA-256: f4d0a28cd9b7f4a02b7bb80291a5f5b0f2d038199a252101127986766345d2ed