Malicious PDF — malware analysis report

Static analysis result for SHA-256 981c3a4bb4984a8b…

MALICIOUS

PDF

75.9 KB Created: 2021-05-07 19:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fb7d626f0bc8be5d09448c75acc33ddf SHA-1: b22116df00ddbdbcac22aba51e7082dbf2ac317e SHA-256: 981c3a4bb4984a8bba0949346b46acf2444fe28a1b16e1cce0d00e90ad95ec1f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=in+the+heights+cast PDF link annotation
    • https://cdn.sqhk.co/vuwipabobatu/dihZKif/mujomafetosuxaramewabovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_5fd3bcd599fc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495975/normal_5ff783dc11572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_6038050299a00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_605a761c0f97d.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/59354256509.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489983/normal_5ff115b64ae20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450727/normal_6004575b8959a.pdfIn PDF document text
    • http://ragofilud.medianewsonline.com/parametrik_ve_parametrik_olmayan_testler.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366978/normal_5fee3e2fd5a8d.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/4xmPgid/misonamona.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/25521649701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_605559a04edbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_80d2fd4a32f64f1995968fa736e9cc69.pdf?index=trueIn PDF document text
    • http://dawejur.atwebpages.com/luguwuv.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_df912b5a929747a9b33a7f47887a0a1e.pdf?index=trueIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_494e94d353904024814f23c5056286a8.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_16700fcc5890409d9c202eda5ccd272c.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_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 4868 bytes
SHA-256: dc95f5e23eec7e0d2d8760b50f8dcb843b5eb77e4e66ccf8b149dce9ad84338b
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 11064 bytes
SHA-256: e6de434c5c7d5b6267df2f239dd5173586422ff8254d50ff8b96b57c24fdf530

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