Malicious PDF — malware analysis report

Static analysis result for SHA-256 07872e2e56407798…

MALICIOUS

PDF

78.5 KB Created: 2021-03-16 22:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff97f0e51ec2c2b246037dae23405e9f SHA-1: 1a235402b99fbb322b4e833586fc0df186fcf464 SHA-256: 07872e2e56407798faa3b6ee2cd11a16120ee8efbef21532007784cfe3787f3d
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 to other PDFs, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=formative+assessment+strategies
    • http://doluridibulif.iblogger.org/large_print_word_search_books_amazon.pdf
    • http://mowisadewojapu.22web.org/4890133668.pdf
    • http://erogan-encolumbia.site/48506381251twklt.pdf
    • https://static.s123-cdn-static.com/uploads/4452376/normal_5ff538bb4c073.pdf
    • http://mexuloxuxinona.iblogger.org/zuzakekav.pdf
    • http://kepukarob.sportsontheweb.net/soundlogic_xt_harmonix_review.pdf
    • http://beautysale.site/what_is_the_hardest_sat_practice_test_on_khan_academyuuv5f.pdf
    • http://zememor.sportsontheweb.net/barnett_vortex_lite_youth_compound_bow.pdf
    • http://orbitan.fun/how_to_connect_my_bose_headphones_to_my_iphone_11nhdkf.pdf
    • http://jepenufi.getenjoyment.net/12939077309.pdf
    • https://cdn-cms.f-static.net/uploads/4446761/normal_603424d879a81.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xogijowag.onlinewebshop.net/dovukosasan.pdf
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_a68da34c70a24cdc9fbb7a6ba2eb48e0.pdf?index=true
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_b020608232f84aa48c3e7a136b8e7f57.pdf?index=true
    • http://linexiziretewoj.rf.gd/protocolo_eras_2020.pdf
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_9d2ad177c1324d4ba861adf13c0dd251.pdf?index=true
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_cdcfd4599fdd49859b088c5bc718f97b.pdf?index=true
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_f08bad28397f4b76b4f0e4c97800ab05.pdf?index=true
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_f09d72bc5a5e4c7b9b707c4f0bea58d7.pdf?index=true
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_74bb875ff54f49b8b0c1cf2dad33de89.pdf?index=true
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_4c8fbc964c824de2be0e5c6e634926b5.pdf?index=true
    • http://nibemodida.myartsonline.com/4598972808.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61d.bin
29130f3b0add08e25e1c24f44bada516b8688e731ca22532fda37f5d1f9c1342		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 4988 bytes
font_01_sfnt_off00010708.bin
d880d9be41d0ddbcf6ac79b7a2997093857c3bf36cf8c9887be269d29fd66e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10472 bytes

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