Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a5d50a1260d27a…

MALICIOUS

PDF

78.1 KB Created: 2021-05-16 18:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 08d463bf562aaa81e6447c897e3a1a0e SHA-1: 53cc1d6c1487a3a787a2c001ae8df846a6e7d0e3 SHA-256: f0a5d50a1260d27a9ac8d39dc2910ca928f0184bdfa15e607a9738caedd745aa
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • 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://seumenha.ru/strik?utm_term=best+wrist+blood+pressure+monitor+for+nurses PDF link annotation
    • https://jerusofiv.weebly.com/uploads/1/3/0/9/130969981/nizupukidinife_xiniwodeporuso_duduwur.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/67231803640.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/to_siri_with_love_discussion_questions.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/54927084909.pdfIn PDF document text
    • http://tesazidon.22web.org/95389760434.pdfIn PDF document text
    • http://dibiwarisogix.mygamesonline.org/mastering_bitcoin_programming_the_open_blockchain_2nd.pdfIn PDF document text
    • http://lovupijuti.getenjoyment.net/jofomeretevakofirafar.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/6081707.pdfIn PDF document text
    • http://kononameve.mywebcommunity.org/26351938177.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/65626791328.pdfIn PDF document text
    • http://tadajixilatu.scienceontheweb.net/nubanogezumadolezuniwepo.pdfIn PDF document text
    • http://jufidozotazi.66ghz.com/luxatuxetitaguxono.pdfIn PDF document text
    • https://wojebera.weebly.com/uploads/1/3/0/7/130775791/jarorizese-wikinajiku-pixoluwedumuf-sutujuvezobajuk.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/214cee6ad6.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/pageru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ximawefab.epizy.com/96304570856.pdfIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_20fad10dbd3f47e1b0854e95c17620d9.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_959c802de79340ceb05cb2954d14e593.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_69575676a9ba4e9487d5bf6c32c6ca4f.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_56ab5ad9b1bd49f4b2c32910dacdecea.pdf?index=trueIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_cee78cd3840f4fcfa7f6a04b971ad483.pdf?index=trueIn PDF document text
    • http://legopabez.rf.gd/15933442718.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/4261096171.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/xibaludivusunuxoj.pdfIn PDF document text
    • http://naxutokotegikad.epizy.com/bejozenukasisa.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/how_to_do_expository_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/baritone_euphonium_sheet_music.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 5256 bytes
SHA-256: c179a46fbd5b1ddb7a19cab942ab0fa6c0a0289e34d2c4524df69fb0090b267b
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 11040 bytes
SHA-256: 9d0c085430534628cc6b4f5448d822b719a5e02f8463d4cf9f29dade8b97ae7b