Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5bfda3ac98a49e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 19:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da7b2d4d4f2439ea1c4c23170ad4a377 SHA-1: 21f1fdee80c2943e60c40d885eb45db9f7c3184c SHA-256: eb5bfda3ac98a49e97be9e4e9aaad33a3a45ebbf8519072e998c654437d143a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161384ea3dfe8b---24543032479.pdf
    • http://autofactory-jin.com/js/upload/files/18500246233.pdf
    • http://www.heksan.com.pl/file/21411454411.pdf
    • http://local-minicab.com/survey/userfiles/files/pajejafiwubaweg.pdf
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/11702990618.pdf
    • http://dzbnf.com/upload/file///ponaxura.pdf
    • https://laughteronlineuniversity.com/images/upload/files/92311366027.pdf
    • http://nmways.com/uploads/fckupload/file/84042527015.pdf
    • http://canissapiens.com/images/uploads/file/89472106591.pdf
    • https://rainbowfurnitures.com/files/files/gexesuveg.pdf
    • https://bitree.com/ckfinder/userfiles/files/gopevipar.pdf
    • http://proreferee.ru/uploads/ckfinder/files/40996909482.pdf
    • http://damosushipleasanthill.com/uploads/files/33627769345.pdf
    • https://farmaciasacoor.com/site/upload/file/10053311839.pdf
    • http://dakdekkersindex.nl/images/uploads/zadexipusig.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1278aab6---lenifivegonorinul.pdf
    • https://apartmani-mestrovic-krk.hr/files/putonozimaxujisekofax.pdf
    • https://assofmt.org/ckfinder/userfiles/files/sozekilusuvuvewi.pdf
    • http://digitalpolicycouncil.org/imagenes/file/10787560556.pdf
    • https://pgp-puh.hr/fck_media/file/mukanizibo.pdf
    • http://gd-weimi.com/upfolder/e/files/20210904115924.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dekudapa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=i+am+malala+book+read+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cd.bin
55023980033e0570b48fed40d93f0d8e6c1f034068209ffe6fcd665bcbb82bf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 17480 bytes
font_01_sfnt_off00010631.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 16792 bytes
font_02_sfnt_off00011e48.bin
df714d4a7958cc8214b6d232da05461ad4e292bc729f929d8cbfff72c189a888		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 10432 bytes

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