Malicious PDF — malware analysis report

Static analysis result for SHA-256 87557f64edf63eff…

MALICIOUS

PDF

74.4 KB Created: 2021-09-12 13:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e86e1c057d7d8cee70ff95dc007976f3 SHA-1: ea4754934ba0b876967f9d4e424d8f775fdcbd30 SHA-256: 87557f64edf63eff08bb2d95e8d6e65d840999059bedec7aab7c1bc79da38157
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including one pointing to 'infrive.ru' with a 'game apk' UTM term, suggests a phishing or malware distribution lure. The PDF structure itself is also flagged as a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=asphalt+9+game+apk PDF link annotation
    • https://24emk.ru/ckfinder/userfiles/files/dogaxezolewokufalemefux.pdfIn PDF document text
    • http://arucax.am/user_images/file/judogegenijed.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/rifokin.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/tinob.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/wuwusapinobuvu.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/83449519830.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/62059818788.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/xigalos.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5ba22d0c12a48833f1d0e41b61b5ca37/28638291613.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/83959638905.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/10546144359.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/99886280781.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c57d059e---xelulerowenezomimikaja.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/23173065940.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/69033158525.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/defogowiworinapabodagasud.pdfIn PDF document text
    • http://esistore.be/userfiles/file/5256739255.pdfIn PDF document text
    • http://exim5.hu/_user/file/raxorakogarejunige.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/jijivopedibife.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/savuketep.pdfIn PDF document text
    • http://domexpo.ru/up/file/vaxotef.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/7978683981.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/ridisiwulozoketoberepif.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_off0000c02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 17108 bytes
SHA-256: 9c05e8f2d9ff582c54b36b955b4c899ce6b7ee90847effce7982c9af999d5e5d
font_02_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 10524 bytes
SHA-256: 65be35384e1cbed7f0894bc50e3c935b40759ea7c7d64d4f6faf3cc579abc324

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