Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b9898fc6cf8af3…

MALICIOUS

PDF

82.9 KB Created: 2021-03-23 16:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6c39d3bfd7a95d77886e4f85b2631cf6 SHA-1: ef03dcea38836eedd2e3373e8f4b1a85712b654b SHA-256: f8b9898fc6cf8af367d7822ea0a67e0a9a7fe2512a336e0e16e9cfced6915b56
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the primary URLs extracted is 'https://baarspo.ru/award?keyword=liste+d+adjectifs+descriptifs+pdf', which is likely intended to deceive users into clicking through to potentially harmful content. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous external links and the PDF_SEO_LINK_FARM heuristic strongly indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/award?keyword=liste+d+adjectifs+descriptifs+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488335/normal_603274878c6c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5fcb5cafa225e.pdfIn PDF document text
    • http://relax35.ru/allow_font_s_internet_explorer8t2ax.pdfIn PDF document text
    • http://zerkalo-fugicar.website/bonage6cm54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_600d318074399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_6010a5f74ffc0.pdfIn PDF document text
    • http://se-mrush.com/what_is_the_story_of_lady_windermeres_fankm9w7.pdfIn PDF document text
    • http://goldstein.berlin/54654100989b6fn4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394082/normal_5ffb9051c9543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_600ffea3a3707.pdfIn PDF document text
    • http://dresdenpharma.ru/puvefilonejese67am3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470821/normal_604cdacf63ff3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_a6c15d6e95b04ff4aed9b414371ca0ef.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_aee6f1aefc7345219ebc3dc26bbb388c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/qu_es_neoliberalismo.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_258f74d5b23c44cbaedb87782b69c06e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liguwubore/revista_o_boticario_ciclo_09_2019.pdfIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_7e184328c22c4fe08d5ef68442820b25.pdf?index=trueIn PDF document text
    • https://e37fb4d6-fac4-4cb1-96d9-cce2dae532e5.filesusr.com/ugd/ed2751_22fbdf8054c74297b4f16b798523c975.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_6318b190e91b4bc9981f2e9572c2606c.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_6880050ebd344e779d988514c9b6f925.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 5136 bytes
SHA-256: 76a6c1e32534467a58897b053dba5c1000d853361c6e853d08e54763c82a8cdd
font_01_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 12312 bytes
SHA-256: 1321a2b840e19192bd9ff156746670566b3ecf80ade54e4ef4cd65ecadb23d67
font_02_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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