Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4eedeacdf5d865a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 09:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 466abc65e31beb61fb6b81c57645fc27 SHA-1: cad2c78287b1fd033f5ba27d3e987832d578570a SHA-256: f4eedeacdf5d865a41eacf7cf944b69ee7b9cb667f462fc5f3b9fd1319aa8ba2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=phase+2+authentication+android PDF link annotation
    • https://fresh-cherries.com/ckfinder/userfiles/files/famezokuzedirewajorarebu.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/toradoziderijotavulomape.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/69231117966.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/56259193590.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad3501c977---98068195546.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/fabadogoronuperevu.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/43826408001.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/jenagomonivakedejizadidu.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/fixuvi.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/57016041259.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021911919228700.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161337ec28edd8---xozuxuzuwusugajaxumageki.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/fedejedifeduxu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/tigekujomuvekofof.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/bevuje.pdfIn PDF document text
    • https://tsegypt.com/file/jusekokejatega.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/63973083746.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/regujowanoma.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46933714280.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/bimafitujelubuleka.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/23885916804.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210905_524D82EE5C6FF168.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/66976260762.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_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 17848 bytes
SHA-256: d602bddc07a20017fb0803d41ff01d0f12d2037fda39689f3bfa1dc6367cde03
font_01_sfnt_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 10644 bytes
SHA-256: 9e2fec9f22abd0ea0672f14a59462db79c3189a3f073d82fc8798653de510f39

Open this report in the interactive analyzer, or submit your own file for analysis.