Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f132b505f16767…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 22:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dfca8aa51bb8766f9c84921fdb4767b7 SHA-1: b7be7e6134bf793774a2dd442fa6acc9d611dcf1 SHA-256: 85f132b505f1676767f5689e0a0ef8213a4f77bca629b425a5fc9d8a82873273
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many pointing to disposable domains, suggesting a link farm designed to host malicious content. One URI specifically points to an IP address, which is a strong indicator of malicious intent. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://primeasset.hu/fileok/file/59502215958.pdf In PDF document text
    • http://dynamic1984.com/user_file/file/jutonogezarunazakolo.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/94917258798.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/55874060119.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/digojidemelilapov.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130a5af2a385---65098397151.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/76436819416.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/92218781773.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/18285991729.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/26213966331.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/devodagewakuvi.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/81540956517.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fosik.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/leseri.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/vegukexaxireteduvos.pdfPDF link annotation
    • http://hooleihomes.com/cms_images/file/70565714478.pdfIn PDF document text
    • https://airshow-bg.com/file/53145653774.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/wovipunaliwedemowapibepib.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/25112331569.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/71362059544.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/pupupim.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/89062541849.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/1996256422.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/pabusopedajarawuvimol.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/25366797334.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6b22f31da531efbfade66ab0392bdbf4/muzabif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=uninstall+hidden+apps+androidPDF 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_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 17340 bytes
SHA-256: 81d6986bdd2c489e3bd433bb92a35e9bfbf8d656474a5547307f893a8e2adca0
font_02_sfnt_off0001196d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 10496 bytes
SHA-256: 5f0b49141abdb9a8e769a9f39dff900a6be99a5722c93f6daa65eede7efca1ea