Malicious PDF — malware analysis report

Static analysis result for SHA-256 53795de2c3560163…

MALICIOUS

PDF

75.7 KB Created: 2021-03-04 20:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9bbb0af9aa8e13d42856fb99af45bb7 SHA-1: 41a08665f944d7f4569bbf6deb8a31b6ecfd39f7 SHA-256: 53795de2c3560163286e568fcbd4394768a14ede8c9ee28c942784716838baf1
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or SEO spamming operation. The primary URL suggests a lure for a specific book search, which is likely a pretext to drive traffic to the malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent related to web traffic generation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • 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://nipisod.ru/wix?keyword=robert+jordan+crossroads+of+twilight+pdf
    • https://razovifizekojo.weebly.com/uploads/1/3/4/4/134439397/9c467213aaf51.pdf
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/sodovivufiten_kuzirivu.pdf
    • http://zogaduwipirow.iblogger.org/21375391618.pdf
    • https://cdn.sqhk.co/pikuworano/hjOhgjh/guide_for_picsart_photo_editor_download.pdf
    • https://cdn.sqhk.co/sitopizol/1igggf8/animal_jam_login_error.pdf
    • http://gotiwokina.iblogger.org/slope_worksheets_algebra_1.pdf
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/buvoruburokorun_salorigo_nimawobatak.pdf
    • https://cdn.sqhk.co/saturarad/nttjfic/macy_s_north_star_mall_hours.pdf
    • https://cdn.sqhk.co/xakatikakizi/4hi40N8/business_plan_template_for_clothing_line.pdf
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/0c4ccbe.pdf
    • http://bifarigudok.22web.org/fuwasozigaxuk.pdf
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/9738274.pdf
    • http://tibujodokerijer.22web.org/fotis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mutodilevo.epizy.com/mathworksheetsland_order_of_operations_word_problems.pdf
    • http://juvujiliso.epizy.com/speedify_for_android.pdf
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_b53a923199624d4e88faed2ae1c746bc.pdf?index=true
    • https://s3.amazonaws.com/xutomoxu/rebolonupowovodenivi.pdf
    • http://litafiwu.epizy.com/14885309969.pdf
    • http://xovipofeguz.epizy.com/vironexug.pdf
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_a2b0ba754bbc406a833f82d75150548e.pdf?index=true
    • https://s3.amazonaws.com/gedimuta/free_company_business_card_psd_template.pdf
    • https://s3.amazonaws.com/fuvidokibet/kartun_anak_muslim_terbaru.pdf
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_584b45d217334e7c94b3bdcbb22d6f69.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_off0000ea19.bin
c3ddfee65c4dc1a3a754148c8d005c68d7abdf37a9cc057c706ae691a16e59fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 5732 bytes
font_01_sfnt_off0000fdaa.bin
677f941488ae31520cf51e570dea7c11373023caa96be01e615c90b5d647f825		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 10408 bytes

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