Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a38ddc9db20dd8a…

MALICIOUS

PDF

82.1 KB Created: 2021-03-31 19:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88ff296d10ddef975f2136bced00f235 SHA-1: 18ab2e36a45bf41cfd44d4ca9bca8d7d3ed6fba2 SHA-256: 1a38ddc9db20dd8a05fb05603458ca590a3fb901ce7c05254cec75a25c3eefc2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to suspicious domains and one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/123?utm_term=tomato+getty+images+er
    • http://axecheat8.xyz/44874844928w5vex.pdf
    • http://raicen.com/31104777214rpfar.pdf
    • http://tujidal.mypressonline.com/70978424528.pdf
    • http://axecheat6.xyz/wijasikuvazokn58al.pdf
    • http://lunesygets.xyz/lead_sheet_cantaloupe_islandwq1lh.pdf
    • http://lumacy.site/49171436007r5mhd.pdf
    • http://creamwalls.online/28921638861n1xpr.pdf
    • http://xanusojuruxu.sportsontheweb.net/properties_of_bernoulli_distribution.pdf
    • http://erogan-oficial.site/ribopuzcbi91.pdf
    • http://dressnbuy.com/do_you_cook_brisket_fat_side_up_or_down_in_the_ovenhq6rs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_7a18ea86f74f413f90a5d9f166da61ec.pdf?index=true
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_0691eb2d307d496a8a097d0bef52cf77.pdf?index=true
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_f933d57ec3264139bebb2c0551f35b8b.pdf?index=true
    • https://bd04a250-715b-4db0-8087-55ec2f714cf5.filesusr.com/ugd/0c2191_b3adcf78268142fd8534b7b12f4ccb77.pdf?index=true
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_c6877ab39c0e4ba9803aa48b2454033d.pdf?index=true
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_4f6c047c24d9464492fdbdc165a5b487.pdf?index=true
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_668336e1630e4b5788253d4d86aafea1.pdf?index=true
    • https://c2245d91-bd3f-4016-bed3-1da34bcfd793.filesusr.com/ugd/9a652e_6da27d2168fa458eaf4b8e1157bd6bd2.pdf?index=true
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_717045eb9ed34b698bd630b5a0be9071.pdf?index=true
    • http://vuxebezedigelun.onlinewebshop.net/allison_1000_transmission_parts_catalog.pdf
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_f83241084f2849a6bf736922da80e20e.pdf?index=true
    • https://5fb3b2f4-e86d-4029-b823-ac5950ddf4c1.filesusr.com/ugd/c0aa49_4f78478585e04658a5625fd867fa88e4.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_off000104cf.bin
fcd08bc323db6cf07f9d1421539952916951e12aa975e723e98172d6145aac87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 5024 bytes
font_01_sfnt_off000115d5.bin
892ece283ade469ce3b3ae6d58ef75fb606f63610d8db339ba11a43f1d395cd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 10860 bytes

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