Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92fb1cf7b3ece2e…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 13:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 164e6813ca76029a1a7baea5609e5907 SHA-1: 1e44c31450930f5419cb5f5ee74a125b53d516cd SHA-256: e92fb1cf7b3ece2e7367c4d9377a50e20ade97a20a8b802529cc59a3b23930e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=which+is+best+photo+editor+app+for+android PDF link annotation
    • http://bilafafafa.com/shopadmin/upload/files/87607117468.pdfIn PDF document text
    • http://bronia.org/userfiles/file/juraraz.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/95464510160.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/53289631195.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/zirer.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614162a54ce63---29290010939.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/tobovi.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/nixexikezeleb.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/fodusepimibofijokuzozokag.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/62319797912.pdfIn PDF document text
    • https://slide-bearing.com/d/files/xizubudufujinijovagi.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/57287255946.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/jixeguzaniwuzum.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kizixifug.pdfIn PDF document text
    • http://esipro.be/userfiles/file/rinabadibesakolexizudizi.pdfIn PDF document text
    • https://remini.hu/userfiles/file/31450070279.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/86509143246.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/66483479216.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/rasoxatowuxaw.pdfIn PDF document text
    • https://j26clean.com/upload/files/bunex.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/71060651707.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/veginitevife.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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 17168 bytes
SHA-256: b65d7c110ed5ee988c80bc69509196e08f16e4edc393d92b6c46acdc24d3e5d0
font_01_sfnt_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC6 10804 bytes
SHA-256: 490aabe3a8872d8e9baaf65e7a060dc304d91ca95b3094c2fa01a45d31140299

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