Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ff2c5767d201a2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-23 19:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b10f2342daa6710d2aa6af6b77d1abbc SHA-1: 1517fbc089ee3df9db88095d522561f2c5c0d254 SHA-256: d8ff2c5767d201a2cfd00f9f0941265ed3a8f2c95be6aba4141f3b29aa0014ca
134 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is intentionally structured to host numerous links on disposable domains, likely to obscure malicious intent and distribute malware or phishing lures. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=pokemon+go+hack+gratis PDF link annotation
    • http://mrs-edu.com/sribati/editor/uploadfiles/44945451892.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/376986548.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96934093597.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/59684449362.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/42226701275.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/47033764588.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/45393018422.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/17154793023.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/zakile.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/42232230844.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/gegap.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/nexuwupofobef.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/22712869033.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109012328415619.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/guwowativufabipajarejorad.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/ramiled.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/35894523459.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/kewuvalalero.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/sugazopalefigalojogo.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/97847533695.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/2280823338.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/sozobapugikulagututo.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_off0000ce87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE87 18108 bytes
SHA-256: d25956e4faf24cba35360aebf0c5611124963cb28447e8d00322faadc3fca858
font_01_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 10724 bytes
SHA-256: f35ffb497b7ab41d51e31bd9a3ec0ab24bd3d8b1314f996466eef1530294337b

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