Malicious PDF — malware analysis report

Static analysis result for SHA-256 38538ffdc7f9c167…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 01:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f3de637aa9ebe9e48844593fc9a0485b SHA-1: 05c424abe583bc0e3091893ccce518d6320c1be7 SHA-256: 38538ffdc7f9c167c2d202242c75bf7fbd27b3c25acda4710e971b75140bb543
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://dui-antidote.com/images/userfiles/file/miberojugivudinozitunuzaw.pdf In PDF document text
    • http://apart1day.ru/file/55056273510.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/xadebutatifokorisi.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/kenotesasuvijafavuxixog.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/lugasa.pdfIn PDF document text
    • https://shevian.com/images/file/rezogaxetizowojokediv.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109242150052607.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/38899970392.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae8cbb0e3---59031806596.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/sakatir.pdfIn PDF document text
    • http://thevalleytrader.com/files/536550251.pdfIn PDF document text
    • http://chinahongji.com/d/files/55750123551.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/lavodoma.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/rekununa.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/88709174906.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/jinimetixufuroterip.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/mopipidibosovegu.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/29810876587.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210908_979E2714E6558DDE.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/70935937406.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/16175974976.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/jufokuvesusomi.pdfIn PDF document text
    • http://nineslash.com/user_file/file/wijogubiboda.pdfIn PDF document text
    • http://huefpdf.org/upload/file/walapidug.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/08c1988013c0ade01368a6c9afe8fc97/1334439079.pdfIn PDF document text
    • http://e-sportis.com/images/upload/xutug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+sword+art+online+dub+freePDF 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_off0000b560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB560 16912 bytes
SHA-256: 543178763c00406fc661eebed6a42a881f99b4961ca732c1211ca6392749985b
font_01_sfnt_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 10892 bytes
SHA-256: 30e59bda64452444b111994747987ed1d711c441de3ac3e48fee99da32fde4e9
font_02_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1