Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e126a2c4b2ac5a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-24 01:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32db5fb871580b89bd2456d0a2e916f1 SHA-1: c5790a04ffa5bc9777edbe46ed36f2c6fe9fda79 SHA-256: 78e126a2c4b2ac5ab0df72c952644815cab02b5c43908cd64415740932bcccc7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. Heuristics for urgency and download button lures, combined with a high ML classifier score and ClamAV detection, strongly suggest a malicious intent. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=icc+pro+cricket+2015+android+gameplay PDF link annotation
    • https://khachsan295doson.vn/namthuan/images/news/files/gunulidujobabowuvuvisap.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-16/20210916185448734464.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/32757265815.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/lamupaxemikokerunagolu.pdfIn PDF document text
    • https://latework.cz/soubory/jukuloxigomos.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/1680238924.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/5000233877.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf5304b8d2---lokogute.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/42656120003.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/rosenotig.pdfIn PDF document text
    • https://tablouri.emilianchirila.ro/imagini/files/tapeveduxofadilinebul.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/gesefixero.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/zitabedizanuxelijaluv.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/xisoxezuwujusas.pdfIn PDF document text
    • https://soechi.com/userfiles/file/65329251456.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/53405527271.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/15505298520.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/zetipix.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/98129255170.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/39297333670.pdfIn PDF document text
    • http://domplus.su/userfiles/files/govoxetozaromuzosanetotam.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/r48b00igojjf34ln9nk39fnshk/23141577035.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_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 19236 bytes
SHA-256: f8b12cfbb80feed84d11be86e40b5b63bb38200c67533aa04fc42a7c26f2b301
font_01_sfnt_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF0 11276 bytes
SHA-256: 3146e1be7f860eb6bb0ab5661cdf35da75cbf420a4742ede57e6c9607ed28b6c