Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e60dbda9ec7c1e…

MALICIOUS

PDF

75.8 KB Created: 2021-03-29 11:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2bc4c6f44823e61e07a253085c80d30 SHA-1: 7f1d311c4ed158760b2d1520a08eea8ee30e198f SHA-256: c6e60dbda9ec7c1eb3aa085cc248e58acb9142cf15de9b953ff1d181b60502df
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful websites, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/wix?keyword=restless+ghost+osrs+guide
    • http://timogefubor.22web.org/worksheet_graphing_quadratic_functions.pdf
    • http://poposiruta.mywebcommunity.org/11515462258.pdf
    • https://vibemabejux.weebly.com/uploads/1/3/4/6/134668328/zapesogir.pdf
    • https://cdn.sqhk.co/rixosadiv/gjcgdij/free_woodworking_jig_plans.pdf
    • https://jodavetofa.weebly.com/uploads/1/3/1/4/131438562/movuzusolupinaz.pdf
    • http://winovigamaj.mygamesonline.org/harry_potter_books_set_used.pdf
    • http://xilibinebosapeg.mywebcommunity.org/complication_appendicite.pdf
    • https://cdn.sqhk.co/furugilenu/cuNFy5j/how_to_cake_it_chocolate_italian_meringue_buttercream.pdf
    • https://xiwotedusogatif.weebly.com/uploads/1/3/0/7/130775269/ropaxesakiso-tapidutuve-wupijo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_e9514054c2ed4bdb82d46448927d29d3.pdf?index=true
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_509a158550d94c68be9b4dcb8834ea0d.pdf?index=true
    • http://kileduf.epizy.com/vomixujufatadirakexoxod.pdf
    • http://wokarodefi.onlinewebshop.net/how_do_i_login_to_wd_my_cloud.pdf
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_bc321d4462d7485ab232a75b31db21a9.pdf?index=true
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_7e6cdf3afa3347d6b1d4bfb9ea2e0656.pdf?index=true
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_e40369b3a631486f93a90e0d2698cb5a.pdf?index=true
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_f21ebd3dca09456088ac12dacaf3a014.pdf?index=true
    • http://bomowufawifebi.rf.gd/8324793057.pdf
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_b2dc40ae15744eb0878f4f9a3af3b8e4.pdf?index=true
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_dd50d474b3ba4251bd3ba2827d763d6e.pdf?index=true
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_74ae0b4338f64e649a11fdf7a9659abf.pdf?index=true
    • http://zozinidusekoz.epizy.com/81423108712.pdf
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_63db4bc91c8d445398fe8c7134594931.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ec.bin
366514ee55067f1de90512e23bae1d249fc60fc25a67826f95c2f3c435deed90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 4884 bytes
font_01_sfnt_off0000fa85.bin
65b17781c2303f63a4da5c199fa90e5ec4a250d42673402a0ac989ddeff6cbdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 11620 bytes

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