Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9902bf6d490edcd…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 23:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 639bef526859438109838291ef9344df SHA-1: 8d6f6a3444ea57a2ca85957a977c3978ddecdc1e SHA-256: e9902bf6d490edcd2b28db4d45e5a57359c413bd91d6492657d7f9ce1d9b5dcf
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several pointing to suspicious or disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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://shopinhome.com/ci/userfiles/files/85578229287.pdf In PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/87521683420.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/lezin.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/5830305197.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/8276570185.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe628118c---tewonufe.pdfIn PDF document text
    • https://podimercrm.com/img/files/pifagisesagotatiza.pdfIn PDF document text
    • http://hibertek.com/image/files/20210915_130557.pdfIn PDF document text
    • http://mopron.ru/upload/files/33630428447.pdfIn PDF document text
    • http://abworder.com/uploads/files/vipadevoteberaw.pdfIn PDF document text
    • https://ubranni.com/uploader/files/vonepobekijolezasav.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109040521019054.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/wofevitupopikagokobavoda.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4c29f856d456fbec0256d0d39f6cbee4/nisekaxebate.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/dimolu.pdfIn PDF document text
    • http://cycling-software.com/files/file/jigilagefo.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/fusigefediburelive.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/10983937331.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/zovaviberejaxawagede.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/42026147646.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/tusobelikuzedez.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210912/files/20210912192835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=barbie+granny+mod+apk+downloadPDF link annotation
    • 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://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_off0000cb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7E 16252 bytes
SHA-256: 000e86dc2030025b3676a2bb7e32896e8cd0823ccbba45a009aba29a69e9fb6e
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 10956 bytes
SHA-256: d97b66ea1317d39d6ae76447ca091090748f5b64b97c25b962ddb0fbff4cda0f
font_02_sfnt_off00010e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1