Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d72df71ceb23d41…

MALICIOUS

PDF

75.3 KB Created: 2021-10-01 10:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f064fb9c93cf7b62f1859002b57d038 SHA-1: 58b86114dddf0f5388457ef64ac88dffc70df69a SHA-256: 3d72df71ceb23d41024ed889c3dafbc26b009ae8ffb2328930b8348c4abaf649
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=get+me+robux+for+free PDF link annotation
    • http://lejuriste.ru/files/file/tenifilo.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/16102485987.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/17583219873.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/30617058360.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/mijugoxunesiworafa.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/derazadonesoduwuru.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/gojaluxulugozigidej.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/tufeponujivir.pdfIn PDF document text
    • http://stefani.cz/fck/file/wisurag.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/1587252950.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/12884205065.pdfIn PDF document text
    • http://freeski.hu/freeski/file/99365782355.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/wumikafaxokenezudolesika.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/jiwagisukufofokamoji.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210908130209.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/74b4d0cddf627fa1d65a4c755560cb3f/12748377299.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/fepobenewev.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/45d77089062bed0a5e90f31e501c07c1/likeramijujovuxuge.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/kisun.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/326163877.pdfIn PDF document text
    • http://kme-kme.cz/files/file/mazof.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/rokakoni.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/resajar.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/tajew.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/lufinafororevunarun.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/lixediditekenikanozim.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/fobizer.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://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_off0000c193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC193 10184 bytes
SHA-256: 2795e21d490b036a39e5f5fac28d5ef59782cdbeed03991f2d6de8a579e6b427
font_01_sfnt_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 17888 bytes
SHA-256: 9fab708a83b969c49d0fcce27998dddbddf578f72c4adc742f72206e8f57d300
font_02_sfnt_off0001072d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1