Malicious PDF — malware analysis report

Static analysis result for SHA-256 e946184428bfd649…

MALICIOUS

PDF

68.9 KB Created: 2021-09-14 01:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5bfab2d81d405feac8fcce5dc869ed81 SHA-1: 6db716a7c331ce41cbd2cd56b8e605ac1186acfe SHA-256: e946184428bfd649ee48c94d07627dd8d9a9cd235f73004b17bc51bd978f1d5b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics flagging it as a link farm on disposable hosting and pointing to algorithmically-generated URLs. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kaparatt.com/images/File/wesefopaderegatuk.pdf In PDF document text
    • http://uniradioweb.info/userfiles/files/70862641417.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/kepup.pdfIn PDF document text
    • https://sapporopools.com/contents/files/92753449943.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/97114246185.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/xuzawibejusumibonem.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/82785247913.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/sisiwerawitilariratupis.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667dbcf231---kivajerurijixuxedukef.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/tofiwaxukazukowuxoxixajiz.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/zogisa.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/mikazu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9fdd460b---79450517794.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/79663766270.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/jilugimosifujexudepuki.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/jonafafadetemujorup.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/xejozagotobogitiwag.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/5146995092.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/pojedasige.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kuzuku.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/pasifawaruzelonikurureg.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/6387623813.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/bazajofobuzegemizeged.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=porn+mobile+games+apkPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/fisetimasirujoto.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_off0000aeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CF 10732 bytes
SHA-256: 58c1798dd707f64c88068e9df377b1ba4d6a7d82f81df8bcb500f8a71ea73c11
font_02_sfnt_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 14924 bytes
SHA-256: 4c682d66b99b0947ab6c329f037653a444830fe9e35b814f9e0bc4d4861a36a6