Malicious PDF — malware analysis report

Static analysis result for SHA-256 8435f026031b7c73…

MALICIOUS

PDF

107.1 KB Created: 2021-03-06 02:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4da979c9cf345d626f4db54a7a993e07 SHA-1: b0aa5b0a876a456fb3e4c2432f24633f996296ea SHA-256: 8435f026031b7c7394d7592a8a7ea42b7f0a03a2f5230dbceb7f70b31d26ba9a
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. The embedded URLs and the heuristic firings suggest an attempt to redirect users to potentially malicious or deceptive content, possibly for SEO manipulation or phishing. While no scripts were directly extracted, the nature of the link farm and the ClamAV detection indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/123?utm_term=capital+markets+day+aegon+2020 PDF link annotation
    • http://nevogixire.22web.org/molecular_models_lab_worksheet_answers.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/uppababy_vista_pram_rain_cover.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/what_is_the_main_purpose_of_partnership_deed.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/revirubapakipemasedidiron.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/24928566863.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/dasanirabo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/warapagefasovi/sukiripusimenilomiduwejun.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_c4559b52dac046a78ce1481ef01f453c.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_42f271206b7f4d7e9c56bbf37823d576.pdf?index=trueIn PDF document text
    • http://sitafefisoju.atwebpages.com/section_138_of_negotiable_instruments_act_latest_amendment_2015.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_060f69f5fb3a46fbacdc85874e987499.pdf?index=trueIn PDF document text
    • http://sijadogif.atwebpages.com/batch_convert_html_to_text.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/ziginutixanixiwilafo.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_45d2abedbe12490589dc824a7227efae.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_6bd76b1ebb974e7aba79124684745229.pdf?index=trueIn PDF document text
    • http://pupuwejerew.epizy.com/gramatica_espaol_tiempos_verbales.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/credit_note_in_gst_format.pdfIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_2cfb94068c1743f49e1c1fa7446e7190.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/30463402702.pdfIn PDF document text
    • http://diruben.rf.gd/pixefos.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_4fde654eae3f4358b3c341ae42071e64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/maserati_quattroporte_gts_2020_review.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_503c10bf761e45a4899386231906f168.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_3c5010d4f3a54ceb8a6bbae2059b2663.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000155f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F1 5532 bytes
SHA-256: c81a2cab70d6b0550bed9853e049b6fd80e502590756f61ee65d2343a9ef00aa
font_01_sfnt_off000168b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B1 11852 bytes
SHA-256: bdff9cc782edc4c768c926c4de3defc8cae91909d1bdd93f9a84f3ac8e31403e
font_02_sfnt_off000190bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190BB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.