Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d84e1705cf1ac3…

MALICIOUS

PDF

86.8 KB Created: 2021-09-11 17:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8df1cc502113424f1dd66e468ae3c8c4 SHA-1: 15a2f76b766b7609840cddd6b640917d8db485ae SHA-256: 88d84e1705cf1ac36585bbe36412c361ef46ffa12f7b59f90831b1502a6561a9
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating a potential for malicious execution. It also features numerous external URIs, many of which point to disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 http://sakesushilakehavasu.com/uploads/files/66653147645.pdf In PDF document text
    • http://dglytbt.com/upfolder/e/files/20210910082127.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/70594880406.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/vimikisifagepek.pdfIn PDF document text
    • http://chinalabware.net/d/files/galunekomufateduset.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/43928703084.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/44891253019.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/rulajukogufuzofiduf.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109062051373946.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/vanemepijoravo.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/26857444882.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/dazipebaj.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/mamibadaxa.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/49958708124.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109030756343603.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613801c74651b---xagisadamob.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/1954313075.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/43812748130.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/wowomijolo.pdfIn PDF document text
    • https://proxus.nl/file/telorubikij.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/68891598345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=award+winning+android+gamesPDF 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_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 10516 bytes
SHA-256: 92e51b10f19c445f0471ef9b5f8e3748d601aa5b39c950aa8a9b4b7d129918d6
font_02_sfnt_off00011efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFE 17844 bytes
SHA-256: d4a09ebc7514f063630429419d62124fed2a98068dbb31f68629fa27580cf81f

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