Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c76367a17714af…

MALICIOUS

PDF

98.3 KB Created: 2021-03-04 22:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f16fb03e212af319087771f1da60f26f SHA-1: d56195be9cf3a0db42c21c2604424bc926bc4e45 SHA-256: b6c76367a17714af4a57a21041aadd348954e3647d9a9ddb72fbaac4953c2a6a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The primary external URL observed is `https://lozipotod.ru/123?utm_term=how+to+adjust+choke+on+honda+lawn+mower`, which is presented as a guide but likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=how+to+adjust+choke+on+honda+lawn+mower PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392853/normal_5ff80e63c765f.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/52415639984.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483083/normal_5fcb1b6ff3d6d.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/unication_g5_pager_price.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_32b1529c38a24a2b8a2639276fb12d9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8c5310-7906-43cb-9a95-33f47ee356bd/48736397963.pdfIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_f47135bf0cc246988fcc611ce6074e0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f937c2ff-3e69-4406-92c5-9f56759eda8f/80870976889.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_a15ee3a321b24e81855042e23c50bff5.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_15cf71df64d142c2a385d9c7e49b5458.pdf?index=trueIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_594995d2a711450083ceacf68e65f422.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_c3a26fe699d045ca8963e3588d575bce.pdf?index=trueIn PDF document text
    • http://jeborawaleko.atwebpages.com/python_interview_questions_with_answers.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_6f74159e14bf45089ddad4248cb23209.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widuxade/95227753028.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/vevujasijub.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_off000144b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B2 5372 bytes
SHA-256: a0454fc04b7959598f2762eb81205423b6f44dc35c244953557f9facd4012c36
font_01_sfnt_off000156de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156DE 10972 bytes
SHA-256: 4a78a18627ad04a3dc15476d5d797ead4a0552e561c743c005288ff12035663d

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