Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd84f936c0c54f6c…

MALICIOUS

PDF

88.3 KB Created: 2021-09-21 05:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abf3e6babcd22f02eaf215c231cc2236 SHA-1: 800776677f00c91402e2baf497f7c6acce8dec6d SHA-256: bd84f936c0c54f6c85009eec33b6c6b57c8a6886d1de4ec70f39ca7ea77e2d00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://panova-art.com/files/file/defewifolik.pdf In PDF document text
    • http://jfhconsultancy.nl/userfiles/files/50132352604.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/69817840412.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/walilasob.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bojugojafabi.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/93820352790.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/fowefovozufifuwukiju.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa745cf52---37961411966.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pubirisetexojuzomomarunus.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/pekatetogimenose.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/gurarivotuxapifa.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b134f1c3881204af7179ae21c610cc99/naguxubonimunusisibemix.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/xorixanupakeraxege.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/37207345076.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/1622026695.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/72542309043.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/jixiwevokoliwadowatatono.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/83319629484.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/zajebedokesi.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/mudowudadinulega.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/wofozoratuzew.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/38839269780.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/rezenomawe.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/kafumuxu.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/21467750893.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/zikuxeri.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/52261838537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=my+hero+academia+season+3+dub+onlinePDF 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_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 15624 bytes
SHA-256: 5d4cfa4fcba5e045212614487f278fb2177d805a197c7434e0ebf2d1073ebbcb
font_01_sfnt_off00012199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12199 11056 bytes
SHA-256: dac7ef9c5bd7b94490874737d925f175b45295209d10c3054ab6f7525d13efc0
font_02_sfnt_off00013b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1