Malicious PDF — malware analysis report

Static analysis result for SHA-256 de13ac1c2f38dc5d…

MALICIOUS

PDF

72.8 KB Created: 2021-03-26 15:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a8cfca833d02d232595ccd2fa2832458 SHA-1: 77e4b9fe2d0d2052a374a4d5070e370fecad901b SHA-256: de13ac1c2f38dc5d35bc6a2aea7471f60450ab1f95d8531b8840ecf70df78dee
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the document's structure and embedded URLs are designed to lead the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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/strik?utm_term=philips+norelco+9000+shaver+head In PDF document text
    • http://bigno.space/vendedores_perros_librof64bh.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/how_much_do_a_hellcat_charger_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/lutakakijuro/ujfhajd/nobutegavo.pdfIn PDF document text
    • http://nicepics.xyz/kupeziwusugelnsihv.pdfIn PDF document text
    • http://bupro.asia/128725964149wmmb.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/rutazufewim.pdfIn PDF document text
    • https://cdn.sqhk.co/zegegajugot/aWVhiIC/64609557508.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/GjdYfgj/45896337211.pdfIn PDF document text
    • http://pelabinowoguk.getenjoyment.net/simple_present_exercises_easy.pdfIn PDF document text
    • http://fewudutizoxom.medianewsonline.com/tesexiv.pdfIn PDF document text
    • https://cdn.sqhk.co/padirazemi/jc2J9ic/deus_ex_gog_brightness.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/JeNRgfn/winterhawks_tickets_tonight.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/feliso/kufugiw.pdfIn PDF document text
    • http://moxapowi.myartsonline.com/93306238302.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/liwigevut.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_12fdae951b444e8194b21f6fc7a3e9bc.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_ec7e3fe4cad74a9dba5a89a2c96a9d07.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_d3e72e8f8a9c4e4f892b48b3c6e2fee9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/automation_anywhere_user_manual_tethys_solutions.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_off0000da24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 5520 bytes
SHA-256: e3fffe02b044ae5d07d8dd59dd36155c0e71817c39e86014c79b3660d92d538b
font_01_sfnt_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 11568 bytes
SHA-256: 60636c80dbd7b8464eff5cc6149307a0f9b328365b18834fc34b78b52127adb9

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