Malicious PDF — malware analysis report

Static analysis result for SHA-256 819a374a6a8bb2f6…

MALICIOUS

PDF

71.6 KB Created: 2021-04-07 03:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 55751ba1cff4f3bac7c5999831f4fce7 SHA-1: 858b563082f42ddb5897bd961da7dbd87edb07c9 SHA-256: 819a374a6a8bb2f682ff827e2a3470ce8645856ccf5c764ef6d9e116f21650a5
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/award?keyword=cambiar+archivo+pdf+a+word+en+linea PDF link annotation
    • https://fakavenudir.weebly.com/uploads/1/3/4/0/134042443/parimo-lezorixazekuvaw-pizezelulitip.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/banubufinisesuw.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/jdthKRV/the_walking_dead_season_1_full_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/paleguvebo/kjbijCt/vipimorazafot.pdfIn PDF document text
    • https://dijajogid.weebly.com/uploads/1/3/0/8/130874349/4000494.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480581/normal_5fc674d767937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_606ce6230d670.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/ragiz.pdfIn PDF document text
    • https://kilixezexixoz.weebly.com/uploads/1/3/1/1/131163494/xefatafusenozam-sinofopozat-ditijamulixezun-dozexeganude.pdfIn PDF document text
    • http://xufotegebiv.22web.org/mergers_acquisitions_and_corporate_restructurings_6th_edition_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_606ae18858ae1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be5c863-e036-4093-9763-3754da1bb6ab/muginidero.pdfIn PDF document text
    • http://tunawibiga.rf.gd/oleo_de_andiroba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a7bcb9-a260-43ad-8e29-446d9868a7d6/restatement_second_of_torts_section_46_cmt._d_1965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1e9f57-8f25-48bc-92a3-001ea31382ba/4453492646.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/up_movie_theme_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/what_is_the_most_popular_drink_ordered_at_starbucks.pdfIn PDF document text
    • http://jufalusa.rf.gd/88959226454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a3b8d5-4578-4dce-975d-d80c766b0eab/systemverilog_queue_of_structs.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/49041727549.pdfIn PDF document text
    • http://pewusufep.epizy.com/lofurinal.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/47420440989.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_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 5412 bytes
SHA-256: 651646e8bcbd2da06e3aac22b94138528b84f47085c0089c629ae8adccd526bf
font_01_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 10604 bytes
SHA-256: c08f3c31ed8895a839a5a4349eaae8828ab8caa4974e41d1be716bdf0efb3549