Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b033e481636b13…

MALICIOUS

PDF

77.8 KB Created: 2021-05-06 18:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 097a22365c50090a40c58c3d991b7366 SHA-1: 81364bbb0f41e9b6225051ec82df645cbf5ace89 SHA-256: 54b033e481636b133a1f6605df4e5fbe52979523a4530cac744323f13b85482b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains a title that could be used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/strik?utm_term=how+do+i+find+my+vedic+sign PDF link annotation
    • https://nedovena.weebly.com/uploads/1/3/4/5/134528917/5169848.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/dfhbjgh/vomiting_blood_liver_disease.pdfIn PDF document text
    • http://dezimazokuxulil.mygamesonline.org/9232308544.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/jjhfGta/zofaluliw.pdfIn PDF document text
    • http://roboludawu.mywebcommunity.org/jurnal_metode_argentometri.pdfIn PDF document text
    • https://vebupefipi.weebly.com/uploads/1/3/4/4/134497137/1335268.pdfIn PDF document text
    • https://sarurudadolixo.weebly.com/uploads/1/3/4/6/134644817/mofujiladav-kakurug.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/idd75Ye/61880785642.pdfIn PDF document text
    • https://cdn.sqhk.co/vitozogog/ifliiQ3/23359160828.pdfIn PDF document text
    • https://cdn.sqhk.co/dumusafikilo/haBYxid/petty_cash_fund_report_format.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/lefugaz.pdfIn PDF document text
    • http://rovepofaji.22web.org/48987513640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_523f44aa8bac439081445ab42189e186.pdf?index=trueIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_91f8bb46f75549a88b0146973b070c7d.pdf?index=trueIn PDF document text
    • http://naxepedawizozet.onlinewebshop.net/wiwosaselatekevipuv.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_30e127e1d504404c90c9506af8531de4.pdf?index=trueIn PDF document text
    • http://rujidafedisezu.atwebpages.com/definition_of_first_aid_kit.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_6a9648ac14854f4696b36746e805e751.pdf?index=trueIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_9477410ede284154906fc759a29b28f1.pdf?index=trueIn PDF document text
    • http://pokuzanu.epizy.com/8819531522.pdfIn PDF document text
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_d6c88fdd9cc945c98e435c2ae5080bb8.pdf?index=trueIn PDF document text
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_0d39b9b5da204a1abc914f8c914a2a00.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_29898cbbeed649d9a18e90dac65a49cc.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_f790b6469d594ecd9f5e015df3f55673.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 5216 bytes
SHA-256: 4ca22c26d573a9059274f3af0da6d46c519edd0d904b5044a86f943ced1008c9
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 10996 bytes
SHA-256: 29ca6e1da1ff79b35239db42252e784b9893822cd3e3cd63aa326eee3210d4f9