Malicious PDF — malware analysis report

Static analysis result for SHA-256 d441f1a6ba8feac1…

MALICIOUS

PDF

76.9 KB Created: 2021-03-01 17:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b0e5d1015983df5fbdc4d143b742202d SHA-1: 83e1cd17215083a993d44ee6d23e3842bbeb0363 SHA-256: d441f1a6ba8feac12aa615a8a8ff193b761a74c3fa3bf77ce35d63bb1deede15
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to a second-stage download or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=ego+cordless+self+propelled+lawn+mower+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454299/normal_603c255f2b1ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_6029a5555b90d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447649/normal_5fef1a1c2f31c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426696/normal_601956dc00a39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460723/normal_5ff2ad2dca1fa.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/pezinedikebuxol-xadozazufebad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_5fd7f97237639.pdfIn PDF document text
    • https://padotugaladod.weebly.com/uploads/1/3/4/6/134615244/jedobibowoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_602d37025e806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412394/normal_5fcb333131a31.pdfIn PDF document text
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/3b645c71c8c.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/dilesaperesisevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_5fdc0a8161791.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozunajovufati.rf.gd/mivibipolor.pdfIn PDF document text
    • http://jatujij.rf.gd/argumentative_essay_topics_for_class_10_icse_2020.pdfIn PDF document text
    • http://topuwagib.epizy.com/61199915830.pdfIn PDF document text
    • http://segalemu.epizy.com/12215802054.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/jusonimimuwatutuniduj.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_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 5584 bytes
SHA-256: 6d4d83488ec9aac805364f01c70a1a677bf5dafc9a5e81e7fe5e9a4409615da7
font_01_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 10636 bytes
SHA-256: 105ab07fbe82012ea531ef31d6d32ba15119f95c312921256046260c09c71557

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