Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b34b857d1722260…

MALICIOUS

PDF

86.8 KB Created: 2021-10-08 09:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3f8dce51e3e3ee1ff40538edff81f36c SHA-1: 9c97e8e4111a67e0224d38d921acb72f04d9a556 SHA-256: 9b34b857d1722260188e9078b5ec7cf676970ec797387a061ba9ac16124214b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicative of a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to redirect users through a series of potentially 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://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/rupoma.pdf In PDF document text
    • https://mmagame.com/userfiles/file/41452967789.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/47747965362.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/49015569008.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/vubakizavakefufiwu.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/16240646477.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/44153752584.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914075337.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/kojoxejepot.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210913_205213.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210919152858839736slj8sg.pdfIn PDF document text
    • http://hk-keber.de/images/file/bafejuzirup.pdfIn PDF document text
    • https://fong-cai.com/upload/files/maxona.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16152435e734ec---nulawopezak.pdfIn PDF document text
    • https://ms01bet.net/contents/files/ganisatam.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/38983771106.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tutexuzupegogedewonok.pdfIn PDF document text
    • http://wsm.hk/images/files/57830647479.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/tematugiwi.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/97191845184.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021092607181670554.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/25078163990.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/59289110838.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/79319982315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+pronounce+backPDF 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_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 10468 bytes
SHA-256: ae165b079a3fd6b8b1e2a14841698ce78cfd1b4f5b112f08c1376a7ff4e57ebd
font_01_sfnt_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 21276 bytes
SHA-256: 1c1f208db1733d9a4dc94d8bcc537b3fb3b5479b88f5d8d0a9158dc2a07d4c7f
font_02_sfnt_off000135ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.