Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d14c51aeca60b8…

MALICIOUS

PDF

110.5 KB Created: 2021-05-15 04:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5811e8e0f2b0e255401bd20f96419ea1 SHA-1: 23aaceef7bb8c443942850dc3020333fba4f57b2 SHA-256: 36d14c51aeca60b89b922030e4742af1ea533b06e1f783003be07eb19f8d35a8
96 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 PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, https://nipisod.ru/strik?utm_term=breaking+dawn+4+release+date, is likely a lure to direct users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to the mass of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/strik?utm_term=breaking+dawn+4+release+date PDF link annotation
    • http://sewukagazub.mypressonline.com/13184246691.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/d77ac.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/ninapovukilikubamanimowu.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/words_that_start_with_step.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/74755083960.pdfIn PDF document text
    • http://gazagidumow.mygamesonline.org/mastering_bitcoin_2ed.pdfIn PDF document text
    • https://vomodubezu.weebly.com/uploads/1/3/5/3/135398809/kifegezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_1fdbfb7311db4550b9edf555fbbd869a.pdf?index=trueIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_ca89244ca40b4e0dbe06efa5883dd912.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/is_harry_potter_on_amazon_prime_video.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_67bc18228713487d8b3d1cdd8a8fd10b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piradi/tagoxisarirabufugipomoxex.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/5080916023.pdfIn PDF document text
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_6ec5f6efbde84bd49c760baf7716e567.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/sejefika.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_0013896b1952415898084ea5a5649455.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/negonanopix/cpft_cqc_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/ley_de_salario_minimo_en_puerto_rico.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/figurative_language_worksheet_5.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/pichuva_kaththi_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/how_to_cite_the_source_of_information.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/xokabomagow.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/88109247328.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/dbms_project_report.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14652 3140 bytes
SHA-256: 7562eff1896bed0fcc4a77cf30100c0ce00d4f98ecc336009f2d1f64b181853e
font_01_sfnt_off0001519a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519A 5284 bytes
SHA-256: 9e6a63226e6d79cd5549cd4544d8158de64b8c93978de7399cd68ff06ac1e0ad
font_02_sfnt_off000163c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C0 14592 bytes
SHA-256: 2551a6839d828db2d42b4fed3322b36a4a091b870de0aa44e2e23840eaabb19f
font_03_sfnt_off000190b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190B7 18068 bytes
SHA-256: e8121dd406ee8bb892a7fa14ad9316963b6f460840ad1b16bd4841b9a5194f04

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