Malicious PDF — malware analysis report

Static analysis result for SHA-256 508621f22c6fa9bb…

MALICIOUS

PDF

74.5 KB Created: 2021-06-08 15:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0002c52e45d193831f33ac28755ddb7f SHA-1: 3c056eadc6988a145dc527bb10ddd8d0c1e704a7 SHA-256: 508621f22c6fa9bba691ea644b744c8e626d3db92f3564842b599eb733997def
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 one prominent URL pointing to krisoc.ru, which is likely part of a link farm designed to redirect users to malicious content. The PDF structure and the presence of many links suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://krisoc.ru/pbw?utm_term=planisferio+con+division+politica+con+nombres+para+imprimir+blanco+y+negro PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369762/normal_6019bdae8b9d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_5fe7102c65ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_603e6662ec002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453556/normal_606667255bac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_606b34384ffef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365540/normal_5fccb086b3644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5fd8204ab0149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406191/normal_604129622c33d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_604e56b73e19a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_6039c6490eb00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_606013cd61d63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pefagisunel.pbworks.com/f/66072883285.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/analyzing_the_red_scare_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cccff457-2cb6-478e-8c4a-9fcfd47a7b11/gujivamafugepugu.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144506757/dios_invento_los_numeros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29913b07-8db7-49ad-a579-0cb800941009/who_are_the_main_characters_in_the_breadwinner.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/higgs_report_meaning.pdfIn PDF document text
    • http://lewomirat.pbworks.com/w/file/fetch/144812379/30975183597.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144682881/psychology_from_inquiry_to_understanding_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e4fd57-5b75-4a4f-84e1-ffa82fa4774b/gaddi_lamborghini_song_ringtone_download_mp3.pdfIn PDF document text
    • http://xizalow.pbworks.com/f/what_are_5_characteristics_of_a_successful_entrepreneur.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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 5776 bytes
SHA-256: 90d4edd914577f82abec14a52fe0a5828c33e0435ffc491fac6bc937e67373ec
font_01_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 11484 bytes
SHA-256: 7abaefc0222989866e7a1ff9b6fdb30279cd2da3139f82ec0385f3393b1ff573

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