Malicious PDF — malware analysis report

Static analysis result for SHA-256 9692711606c8a71c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 23:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b46abace9542616720900923d911a09 SHA-1: a558d89e53dc801ccee83829177507354754dbd9 SHA-256: 9692711606c8a71c64408d4ec8f036fea21d3f49f22436111d0f262bd39a590d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which appear to be part of a link farm designed to redirect users. The presence of JavaScript suggests an attempt to execute code, likely to download a second-stage payload or facilitate phishing. The numerous links and the ML detection strongly indicate a malicious intent, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=8+ball+pool+hack+unlimited+coins PDF link annotation
    • http://perfect-aerosol.eu/userfiles/file/74129669709.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/61686129522.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/69649158775.pdfIn PDF document text
    • https://uangraja.com/contents/files/wavipalapopoluwizagunire.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-2/20210902115904806574.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/16870150933.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qrhghkbh6ri7ighp2bogvph2h9/1763860989.pdfIn PDF document text
    • http://innotack.com/userfiles/files/vifiz.pdfIn PDF document text
    • http://maulich.vn/attachment/files/gigepipeluvoxezudopan.pdfIn PDF document text
    • http://dges.in/userfiles/file/zinotudigo.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/gubamixetabaruwoxuvon.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/pepesanuteduv.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/63245663371.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/53083624046.pdfIn PDF document text
    • https://shidoremicrosys.com/media/18313596633.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/58993311817.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/26254354825.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/db4c16a823a146a64854f73ed50179b8/muxubibudiw.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/40216745851.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/59989747372.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/80433777464.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/69190314059.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_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 17632 bytes
SHA-256: 280d6a70416f614648354279b1362298339afaf58df4bb73e6ba5f11ab78c2c2
font_01_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 11120 bytes
SHA-256: 418df84fad7994de27e936b96238a25ce1a8428e44712173f05cf39e2291d17e
font_02_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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