Malicious PDF — malware analysis report

Static analysis result for SHA-256 871cf151a8fe6649…

MALICIOUS

PDF

77.8 KB Created: 2021-09-11 11:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 115260595cb86d791c2d86bc81421213 SHA-1: 7054f0d02ca79a73f436067ab52603461084bc42 SHA-256: 871cf151a8fe66497855af334744ef30966569e7e834bf7f2e7c2ce9bc64f80b
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the purpose is to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/turin.pdf In PDF document text
    • http://adice-area.com/pictures/files/kajonegirujufikebox.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/89013533406.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dolenewowurabolu.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/15840487442.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/76913848067.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/57230792160.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/49397163335.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/75144766668.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/79943887756.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/ronebutofoveromenovobomop.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/nuvukuwiwigomedevazul.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/776897639.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/82920284835.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/xirumupizasopawanolode.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/nogora.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/23797106769.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/naniluzinibutamibulala.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/simumunu.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/lefivi.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/xizunosago.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/lunefuxifofipenejozisit.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/xotonerib.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/42404791720.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/24410351868.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/61698157531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=toca+life+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_off0000ce2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2C 10388 bytes
SHA-256: 0739a3a9e85156640fcfc2b859e3cedbdc86cf9523acbf7e3802048c22789bbc
font_01_sfnt_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 16808 bytes
SHA-256: d079781896d913fe5e5ffa95fd346f652034ea93b82091fafef1835bbfbc045b