Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0f761136aa3d6e…

MALICIOUS

PDF

86.9 KB Created: 2021-03-30 09:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e19ef26466b46b0fc6dc3718896140d8 SHA-1: 0bed07dbb34b97b2f811cb900f60be384e27bfbf SHA-256: de0f761136aa3d6edc4bea5feb2b9f4b8b308d341f371670d26f2e6ad9a0de50
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and at least one URL is known to be malicious. This suggests the document is designed to lure users to potentially harmful content, likely as part of a phishing or scam campaign. No scripts were extracted, but the presence of malicious links and the overall structure strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=andrei+tarkovsky+libros+pdf In PDF document text
    • https://cdn.sqhk.co/livulopo/fqMO03x/guzugusovazimopetobip.pdfIn PDF document text
    • http://nizuvifoko.iblogger.org/19732717671.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/jheOEyS/nojiteb.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/mYhTmIT/canada_dry_class_action_claim_form.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/vipuxafol/sword_art_online_alicization_ending_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb5d836-acea-451c-96ce-4cfe5a453e70/tepizize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43deb68-4026-4d94-afa9-1b146659d275/lemozakexami.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_9b061bc49bf5425b982003dd6eaf0635.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c58aa7f-146e-4c72-ac7a-044948698b02/30214361937.pdfIn PDF document text
    • http://vunowobaxab.epizy.com/jasag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2513c044-0c3e-45b9-927d-1996f5d85424/icd_10_code_for_septic_shock_due_to_covid_19.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/do_ionic_air_purifiers_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9bd618c-7540-4838-84b9-0a5564db66ca/bixivarurusiguvusowekij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0271d66-88ae-405c-9c0f-c21d214e273a/masafe.pdfIn PDF document text
    • http://forapijedowuvo.rf.gd/26234830209.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_9eb91908b4054f568a67883f7c794c52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/475a795b-91b8-4761-9054-fd8df4095d75/you_capitalize_school_subjects.pdfIn PDF document text
    • http://zifejurujudeku.epizy.com/rariximobajadamarakaka.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_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 5388 bytes
SHA-256: 3f99cd02a67aa46f1eebf4bd605242f65d888cee5017eab9a20163cc0244348c
font_01_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 15636 bytes
SHA-256: 896cbe7c7edbc02b0e3877eee5e3cc0c6028cf8af29ab50a8d7cd1293cf357df