Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e94773fc0c92baf…

MALICIOUS

PDF

80.5 KB Created: 2021-03-16 17:04:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b31efdc27bf6c32e42d320d9d6908ed1 SHA-1: 16238a20ba63b4ea47c94ead9217ccaac3d20d0a SHA-256: 5e94773fc0c92bafd3892db9f1959c2100f96174cfba436b40a7b6f866a64d20
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI and multiple other URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://druttle.ru/award?keyword=maximum+strength+workout+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5fd9437c06b0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470029/normal_603759dfef748.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392877/normal_5fe26d0dc68be.pdfIn PDF document text
    • http://vexawenebo.22web.org/fetinusutugizatufeluluj.pdfIn PDF document text
    • http://nidomamedop.22web.org/birbal_kannada_full_movie.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/how_to_use_graco_snugride_35_without_base.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_60311f800db62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_601d5ea4f1a33.pdfIn PDF document text
    • http://gijipodotetojo.22web.org/85649917611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_60378fcac7ee9.pdfIn PDF document text
    • http://timinome.getenjoyment.net/dipofojob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wukara/julavolel.pdfIn PDF document text
    • http://jawikiluzejibe.epizy.com/47208015748.pdfIn PDF document text
    • http://volififujuwimi.epizy.com/66262345151.pdfIn PDF document text
    • http://masusoxowep.onlinewebshop.net/yasin_sharif_in_urdu.pdfIn PDF document text
    • http://jujobope.atwebpages.com/dazat.pdfIn PDF document text
    • http://gozidonozali.myartsonline.com/pepivuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/7988300665.pdfIn PDF document text
    • http://tepobibofa.epizy.com/conspiracy_to_commit_burglary_sentencing_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/22954051105.pdfIn PDF document text
    • http://dorediludopa.epizy.com/liletuzimizufedir.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/fegibukagukesaguvuwazezi.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_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 5652 bytes
SHA-256: 51e856558eebf59db0adc332fdfcd36f1282f029a19f241d10e8f9dd7d7a3b7b
font_01_sfnt_off00010f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 11016 bytes
SHA-256: a9e77ac53eb5265a3eef0c26622eea22471b2f47e3f17db255b35488e4bf856e

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