Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79371a6723f60b9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 14:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c14aab67f084bc8b45ae89371621212 SHA-1: bfc7bd5a79e180129ed1c141ac5501c450e10ec2 SHA-256: f79371a6723f60b9e38181ca9503542e47f6ea2fb21fc5ff98db0caedfd3a866
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a non-clustered link farm on disposable hosting, indicating a likely attempt at SEO manipulation or to obscure malicious content behind a large number of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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 http://royalrep.com/userfiles/files/xubobogumugazajot.pdf In PDF document text
    • https://vegan-eshop.cz/data/file/52443247789.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/34287478929.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/konubowotazupuvewebenu.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/79061424984.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/81623359544.pdfIn PDF document text
    • https://atavio.ru/files/file/pebixa.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/kelarobedera.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/nozexijidajunarureguse.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/negebonigidas.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/15701701396.pdfIn PDF document text
    • http://househouse.it/userfiles/files/gisobajugumurona.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/danuzamolozilexexigitolem.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/51816123210.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/zelipapalaw.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/bubopegitumabag.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/56544773308.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/mixevosegu.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/43007582829.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/sevil.pdfIn PDF document text
    • http://robedecreateur.com/img/files/2402216661.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/lazusunudikevo.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/nurutamu.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/19090251596.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/88778362226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bangladesh+army+job+circular+2019+pdf+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_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 17840 bytes
SHA-256: 9dc4ab1ee512de628ca5a2f357a265df24f3e7221d0475aeb783105daafb5e01
font_01_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 12052 bytes
SHA-256: 278b6a5accb77676edd9cb0cab8bdd10a59481e5509b770d0c385a04bb89d8d0

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