Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5236f943aa4ce7…

MALICIOUS

PDF

77.4 KB Created: 2021-02-15 06:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45168961d814aa103071b62b1338476e SHA-1: 20dfe15f2c2b8dcc4780f3731608abffc8a878ef SHA-256: fd5236f943aa4ce737364643745e7a7bf59bee5cecbfeb0e65ce467eb32a70b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://leonvi.ru/wix?keyword=dimensional+analysis+worksheet+unit+1+lesson+2, is directly embedded in the document. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware through the linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=dimensional+analysis+worksheet+unit+1+lesson+2
    • https://cdn.sqhk.co/vakenuda/gh3u2a7/commuter_auto_sales.pdf
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/99be6.pdf
    • https://static.s123-cdn-static.com/uploads/4453342/normal_5ff2f0773fc33.pdf
    • http://kkkirrreeee.space/39386528656umbdn.pdf
    • https://cdn.sqhk.co/mopomotop/CVhfDje/best_kung_fu_fight_scenes_in_movies.pdf
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/d6f793e27.pdf
    • http://idclick.cash/7459816945xy1y7.pdf
    • http://springwin.space/infinity_ward_mw_supportsy4l3.pdf
    • http://ttttrrrr.space/75349092554kfx4w.pdf
    • https://cdn.sqhk.co/nazabimon/hgjcYje/38625446680.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zeworibuzoza/wisconsin_articles_of_organization_form.pdf
    • https://s3.amazonaws.com/likerajatob/vpn_proxy_master_ios.pdf
    • https://s3.amazonaws.com/wutogugej/pneumonia_guidelines_2017_ppt.pdf
    • http://nagofubufi.epizy.com/33801221201.pdf
    • http://lidiremuvuzanas.rf.gd/financial_analyst_journal.pdf
    • https://s3.amazonaws.com/xupimaral/95474056424.pdf
    • http://maboduxivugiv.rf.gd/chinese_jeans_size_guide.pdf
    • http://kevarivujez.rf.gd/jafajavef.pdf
    • https://s3.amazonaws.com/rovikibixu/15406460143.pdf
    • http://zotinulimoruv.rf.gd/direito_penal_cezar_bitencourt.pdf
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e444.bin
b9901e6698cbfb38b26dbb628416adab5c96bc0744a1b642ac5d9056e4aa78c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 5248 bytes
font_01_sfnt_off0000f603.bin
213c40db698e3b49eb1f833dd3e52a6a7117d61a60ee81da8ca20378f14f6f38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 10576 bytes
font_02_sfnt_off00011a30.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A30 4324 bytes

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