Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd90fa842fa4dbaf…

MALICIOUS

PDF

68.3 KB Created: 2020-11-17 00:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6135ca3577c278f268755d53213850cb SHA-1: 71bd20b27634db16d4b0ea6e800f542ef7164b76 SHA-256: cd90fa842fa4dbaf139b3b6d6dda86ae30b53a178d64ec9849969a289f912d3a
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=car+game+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416504/normal_5faad63e92e11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_5f9397285add3.pdfIn PDF document text
    • https://zinawadasug.weebly.com/uploads/1/3/4/3/134312837/6179874.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dekegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_5fa0ac7080819.pdfIn PDF document text
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/mepesotosonux.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/xigizumibegogeb.pdfIn PDF document text
    • https://sexiguviwuzokal.weebly.com/uploads/1/3/4/6/134687255/7bab10afb00a71.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/92b11240d9c88e.pdfIn PDF document text
    • https://deledixedebudon.weebly.com/uploads/1/3/4/4/134499708/loserofu-dafawik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f93b8e08a06b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a62d16-8e20-436f-b55e-a21578c0afe0/tedoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0509cf3a-95ad-448f-aaa4-02153b118467/probability_and_statistics_4th_edition_degroot.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_off0000ce31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE31 5192 bytes
SHA-256: 6105a59dad804fa12661dc4762fd8bbf300fffc1dc636d139a164bc01a720627
font_01_sfnt_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 10884 bytes
SHA-256: 5015362e4b10c4cf0a298d9aa6d83cc76e9622c0291cff197f0c642a0937743f

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