Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebfbb3c79b0a840…

MALICIOUS

PDF

84.7 KB Created: 2021-02-11 23:38:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b45b060cd176b46f9fc118cbae89d2a4 SHA-1: 7e700adbfc8ecef74280c376d56c28edd4a844de SHA-256: 6ebfbb3c79b0a840f9ed7f4564a4b1710ae5718c7df9dd5c5c8f53adafa41dae
184 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains multiple embedded URLs pointing to suspicious domains. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic indicates that at least one URL redirects to known malicious infrastructure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a pattern of using disposable hosting for link farms, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=arifureta+web+novel+pdf In PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/xobezuziravif_wazubikoros_gobinonuwaxij.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/sofojanelewopig68ica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456116/normal_6013064de9cdb.pdfIn PDF document text
    • https://ximizewilaxeju.weebly.com/uploads/1/3/1/3/131381769/25138feca6008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368492/normal_5fec463c32873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382949/normal_5fe5df87ad508.pdfIn PDF document text
    • http://3bki.ru/puxosapaviporimomumixarat2gq1z.pdfIn PDF document text
    • http://blue-tick-central.com/exercicios_resolvidos_trigonometria_no_triangulo_retangulo_9_anolyqmv.pdfIn PDF document text
    • https://vopifubuk.weebly.com/uploads/1/3/1/6/131636719/e3ee873a3632615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_600d0c744809a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496153/normal_5ffd60a0e8d77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_600f0d9fe4b40.pdfIn PDF document text
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/289f62f.pdfIn PDF document text
    • https://tadesurirow.weebly.com/uploads/1/3/2/7/132711952/fewevaruxuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_6018e97e30ad5.pdfIn PDF document text
    • http://inmyshtangen.xyz/79108674898yz4do.pdfIn PDF document text
    • https://lidutefavova.weebly.com/uploads/1/3/4/0/134012516/28a2b27fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://topufopotu.epizy.com/tomarofiwukejuvodaxezu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 9300 bytes
SHA-256: df169443873ceb7d0e067e7fce7fcddf80fea1ed5a5aca851b4c0aeead4e9ab2
font_01_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 5136 bytes
SHA-256: 982212bd648fb0fc41a364e7d141d40ec6e42cbff7cc8d2ee71d3f6e8a586d2e
font_02_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 10248 bytes
SHA-256: 2a1cf709723ba792df3488bc51e9a1f0de13fc10cdac7a53ce8691f1f3a2f27a

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