Malicious PDF — malware analysis report

Static analysis result for SHA-256 5573ad8af0c971e7…

MALICIOUS

PDF

77.4 KB Created: 2021-03-30 13:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71bc57db8dd53781f576eb0bda2b588f SHA-1: 7421b1eefb654baa7087548b6475b176e1456904 SHA-256: 5573ad8af0c971e755f68752d028fb4e6887af6532503047febf0beb67b1300e
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 disguised as search results for specific keywords, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious websites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/wix?keyword=nissan+350z+manual+shift+knob
    • https://cdn-cms.f-static.net/uploads/4489251/normal_600b136593a7a.pdf
    • https://tidoleji.weebly.com/uploads/1/3/5/3/135396674/webatimixuliw.pdf
    • https://boxenujevodaziw.weebly.com/uploads/1/3/1/0/131070305/61bcf64f1784ff.pdf
    • https://cdn-cms.f-static.net/uploads/4465018/normal_605d75389aec9.pdf
    • https://tefuvaxijo.weebly.com/uploads/1/3/0/7/130739162/ec7c0a7.pdf
    • http://peludofnor.fun/denon_avr_1905soc8u.pdf
    • http://theharaka.online/68709016210cg8fm.pdf
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/fidedo-tiweralirubif-wupegoxilis-detebilabon.pdf
    • https://kuwewukes.weebly.com/uploads/1/3/1/6/131636575/mogaxamoma-dopigijub-sufijo.pdf
    • https://vemegerefawobe.weebly.com/uploads/1/3/2/6/132682093/fipon.pdf
    • http://sweetygirl.club/amazed_emoji_japanesel54zi.pdf
    • http://cashfree.store/how_to_reset_drum_on_brother_printer9x3lw.pdf
    • http://storeeuro.info/cease_and_desist_letter_templateskspp.pdf
    • https://static.s123-cdn-static.com/uploads/4427105/normal_5ffdea6d00ac7.pdf
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/zajadoz-kixoxal-samizu-madanabogorute.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_80d694234d3644bab07af7bd2691031a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/abcc7f1a-15ba-44cc-b238-5e9945fb6a28/gaxemunesixesaxuxepewog.pdf
    • https://uploads.strikinglycdn.com/files/79f099d4-ca1f-482f-8c13-dfa4a01bdb77/predator_generator_4375_watts.pdf
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_d7ec44d009814053beb61f0320f1041c.pdf?index=true
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_251944e86f834eb08bdf90a0f67007eb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39855929-369a-4d6e-9648-9dcc71db4a87/pinofumefofu.pdf
    • https://uploads.strikinglycdn.com/files/72b96422-389a-4e66-ae4c-a81c587e2e02/configurar_router_cisco_wrt120n_como_access_point.pdf
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_005de7d51fce44d68d7223c1aed8b2c3.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_off0000ed82.bin
d77c14a8c53cfb1387bde387b67ce36c74ff7264bfb2d019a4d801e239cff361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 5564 bytes
font_01_sfnt_off00010057.bin
a1cf9525c4abbd81f609ebf46649855f8d07ddc29daee1440b65041b3a6bf9ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 11168 bytes

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