Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a5beef2dc5fb97…

MALICIOUS

PDF

85.1 KB Created: 2021-03-14 17:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49bba1a942946f7f68bad44e976fc5f8 SHA-1: b3c15fc254d8f7b0a4c0e896e494cf22e35f27f3 SHA-256: e4a5beef2dc5fb978e290e025d7e7391c21b4ff5109e90bc5c344acae8ad715b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, a technique often used to redirect users to malicious websites for phishing or to download further malware. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of external URIs and a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=nell+mcandrew+tomb+raider
    • https://cdn.sqhk.co/dekawako/jbxUQU4/forrest_gump_sheet_music.pdf
    • https://cdn.sqhk.co/dusimefosix/ilhbibX/vanilla_cake_recipe_easy_at_home.pdf
    • https://cdn.sqhk.co/lemisobe/jfgfGjc/coffee_weight_gain_or_loss.pdf
    • https://cdn.sqhk.co/jijubexovoz/cmegdgg/bokupebufokufidokuxos.pdf
    • https://cdn.sqhk.co/roretuduva/hd6aNOp/kufutebos.pdf
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/xarebivev.pdf
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/kupumefuvalum.pdf
    • https://wegogitizunivom.weebly.com/uploads/1/3/4/3/134369171/3293277.pdf
    • https://cdn.sqhk.co/suzeboxiwo/ahfC45N/sabaxogogeratizak.pdf
    • https://cdn.sqhk.co/zirizowesaw/1hdn07o/gladiator_glory_game_mod_apk.pdf
    • https://cdn.sqhk.co/pobopuwubox/igHSic1/tiposawusonevowuj.pdf
    • https://cdn.sqhk.co/wadupaxi/gjaAhCG/pac_learning_vc_dimension.pdf
    • https://cdn.sqhk.co/bolomadu/dl6hbRl/sazukosaju.pdf
    • https://cdn.sqhk.co/petebeki/gj534gg/nvidia_shield_4k_hdr_review.pdf
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/karip.pdf
    • https://cdn.sqhk.co/vilubofi/ibifNgg/market_restaurant_long_beach.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_a914893b2f2c44d8889494593ec9d468.pdf?index=true
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_966f2dba69f1457b874eecb0bca215bc.pdf?index=true
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_c43564c6bda146d5bc60b8caaa6cf241.pdf?index=true
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_32a05ce388af4d069b6b98e462da38ff.pdf?index=true
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_b81ee5a5fcc148249897ff21065a5653.pdf?index=true
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_0345a1f6cb4f45ecb07107f58bdef967.pdf?index=true
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb3.bin
5d5ece1484e1da1cf1d8bf94b7197f70595c068ad41cbdcae1d6e8e936567149		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 3032 bytes
font_01_sfnt_off0000f896.bin
6868e9e9d76eb11186aae5587319ef5f1f45a435993709ef78cd05e933c03b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 5108 bytes
font_02_sfnt_off000109f0.bin
402da266d1f59340deeb70817691918595c43298b87ad7703560048ad5fa8d06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 10912 bytes
font_03_sfnt_off00012f94.bin
4f6d6443d667672870c38ce4e1d364e29e61a0df6fd2d8217a47270b9fff04c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 16132 bytes

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