Malicious PDF — malware analysis report

Static analysis result for SHA-256 476b227b0903749e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-24 13:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd85262ff1a1cfa7cf57c7a60054c5c8 SHA-1: 450e20d005d0844a173efaf4685d15f2df47d961 SHA-256: 476b227b0903749eb2ef7462be8e2ac52628a1e26db3c101a34a3b284c08c13a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of embedded URLs and the heuristic indicating a link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=how+to+recover+data+without+usb+debugging PDF link annotation
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/77844735013.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/nevewebupufumunodataroxuv.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/jimozonogixomu.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/50247262571.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/fazatavunamamanoni.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/zoludenam.pdfIn PDF document text
    • https://msiutilities.net/documents/luruf.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/614930a359fe0.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/99600638851.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148164d6d11e---vudejuzeseju.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/gosegotuvubonuw.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/59864221489.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/jasumufetoturi.pdfIn PDF document text
    • https://geniodelweb.com/file/60221938344.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/mavofipujofoxemu.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/pusawexosuwiratotogunegug.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/wixutonuxidedib.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/40916567967.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/pisimunawiwuvijasimura.pdfIn PDF document text
    • http://packturf.fr/files/48060066685.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210919224744.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/4209959500.pdfIn PDF document text
    • http://360global.ca/userfiles/file/gonabigalovujativevesega.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/joxemetod.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_off0000b385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB385 17472 bytes
SHA-256: c4660428a999d4dc494c6bfbdd196a875f707a7aa1d803a4c24eb278f2af2b5a
font_01_sfnt_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 10984 bytes
SHA-256: 6ef1115f3d84930fc3fc19e8ad74de1b3d4a1240677208f1a20524e7fdb82321