Malicious PDF — malware analysis report

Static analysis result for SHA-256 323bc685899c79c6…

MALICIOUS

PDF

72.6 KB Created: 2021-09-14 14:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7340efc2735655ca2525202ea868de1 SHA-1: 3afd77994d8db518849e70ab9d3613aaab79fb2e SHA-256: 323bc685899c79c607bea864df34b5be3293900cfaf7a369539967f25ca298e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=coc+mod+apk+s1 PDF link annotation
    • https://gemwares.com/userfiles/file/senumodojijemujoredu.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-05/images/files/fixovatuneliregozuz.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/16980399325.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/62938129008.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/25605632576.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/61413911041.pdfIn PDF document text
    • http://lulanjina.net/upload/files/puxisafu.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/71725052111.pdfIn PDF document text
    • http://minhanh.com/files/19578658507.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/fumasada.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/rusarifabuxasugobuzobilam.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/virunolobutanirigowajot.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090415184288.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ebd4d882---47905482512.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/39152284879.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/3294348615.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/xarawajofedidodabifoxet.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03ca02138---81336093756.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/24753459236.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/vediwekonuruzefumokeseli.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/sijisebusulobidafi.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/zuvizatalibagenom.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/25900998382.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/85447985944.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_off0000bb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB14 10280 bytes
SHA-256: 34b3c1d9176ad088238f6df3d0f4af9aa8606d85a11ff69030de0756ff2c608f
font_01_sfnt_off0000d244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 16480 bytes
SHA-256: f09974b47fe0616a1ef2ff58782c0e7db0db882a258652ec3b955cce9655877d
font_02_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1