Malicious PDF — malware analysis report

Static analysis result for SHA-256 4549ce497898248a…

MALICIOUS

PDF

89.8 KB Created: 2021-03-18 17:04:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b097815983f18b983173dad02217ece3 SHA-1: 2964c1cd90e4482c4b6ddf99ed1adc9db94c129d SHA-256: 4549ce497898248ab19764763445c4ead9f709448856403d581d2540317666f1
186 Risk Score

Malware Insights

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

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 0.9996

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://vilenefex.ru/wix?keyword=vivitar+dvr783hd+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428331/normal_603fc58b2e6a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415080/normal_5fdf2551693b5.pdfIn PDF document text
    • http://zubiki.top/516053232146lv77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424637/normal_5fdac601b6951.pdfIn PDF document text
    • http://goodxday.xyz/the_exorcist_movie_reviewl3z58.pdfIn PDF document text
    • http://meinekarten.best/93436778956whktf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_6020090d58619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485299/normal_6015419b50730.pdfIn PDF document text
    • http://ig-socialmedia.xyz/73799461030n351u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_6030336fe678a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_6016e3e6797ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450624/normal_5fd1a747f21df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/what_is_the_purpose_of_project_management_institute.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_1af2eb43f5104ca99bd2aecd2371cfc2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/nanda_diagnosis_2018.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_75d1b825032145ea860d8b3ebf64310a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/golepe/tetuvoruk.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/sadulupamujisavatovuloral.pdfIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_9bdc19639637412aad368196fd82fdd8.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 2856 bytes
SHA-256: 06658ff1146aedab7587ef7bdfa079559ce90d200873ebd81ef96e65ef921add
font_01_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 5224 bytes
SHA-256: ead3ebe18c14a4a9d8fadecda33486a22629cbee2fac767577f878994555c98e
font_02_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 13188 bytes
SHA-256: bd294e0f94b821c585989d90ba83afc9310a7d8d09c531e8a853362251bdcb37
font_03_sfnt_off00014ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e