Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a6f565dd021521…

MALICIOUS

PDF

90.2 KB Created: 2021-03-25 21:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d39309983870316e6dd336fc7709e075 SHA-1: 86b28f97805af1ae6a65e0c720ea15f963f14cb8 SHA-256: f1a6f565dd0215215af8084dd27b095e30200d22644351c3a46274c9b6f91cfc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URI heuristics point towards the use of JavaScript for redirection or exploitation, aligning with common phishing techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://pelibifir.ru/wix?keyword=philips+norelco+7310xl+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484376/normal_6037b8a1e0bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5fd3048015ad1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5fcc51830e6ac.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/Yhjajg2/sufowezoxunolimutagalex.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/receptionist_self_evaluation_form.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/fiaEjdY/gopoloxejanebed.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/rogisodupo.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/Njjgeib/mcat_testing_centers_in_washington_dc.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/hieLHij/948007903.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/starbucks_employees_work_hours_do.pdfIn PDF document text
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/donozatikeniw_fabedotepikaka_safuzenuvoj.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/60bf86f7-d1cf-4868-a545-1ddcb8c664ed/asi_hablo_zaratustra_libro_mercadolibre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3233e38-04bd-41c4-bd46-ac44969a1360/rovusuriletevez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae39395-cc70-444a-b278-b7f315553dff/metijejisupeziwika.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/70841296029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a57fe7-8c6d-410d-a287-29b3d1316075/puziman.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/bernette_705_sewing_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f0b770-3b24-4db2-86f6-7eea3878c906/julius_caesar_film_2002_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/collage_maker_app_free_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/57289172838.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 5680 bytes
SHA-256: cd4cd1d4b53d6e9f937e17d18ed3b530a742f761d7e43edb048c9c3e1caada44
font_01_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 13724 bytes
SHA-256: c77812aa2dbfd38b4db39124599feb1a75d98daa6ab1d8e9c8fc8274ee067b6e
font_02_sfnt_off000144a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A4 16076 bytes
SHA-256: bfd5fcdb7495bed175e4f51938194e2ecb7e505d90535bc2124716332a04a4ab