Malicious PDF — malware analysis report

Static analysis result for SHA-256 99eb9eaa442184e7…

MALICIOUS

PDF

70.8 KB Created: 2021-03-16 15:04:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3e84cef9fae11c7b1a883b0825e8017d SHA-1: bf777c7cb4c1a85be7acb526036c367119a0f80f SHA-256: 99eb9eaa442184e7dac97affeb35303164286b8e08926a3832838ddc38f1d8d1
126 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('xezojetit.ru') that appears to be part of a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to direct the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=%25C3%25A7engel+transferencia+de+calor+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408995/normal_5fe55b2008681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_5fea3c9844e42.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/48273379874.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/98698344113.pdfIn PDF document text
    • http://circulshtangcalip.website/3730292617cdx5n.pdfIn PDF document text
    • http://forkidsshop.online/youtube_photoshop_cs6_tutorials_deutschz9o85.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/wowuvumuniri.pdfIn PDF document text
    • https://dunudafulu.weebly.com/uploads/1/3/1/0/131071166/vabumew_nuxoneko_dejaxamukip_ximexazofedujan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464709/normal_5fedf5c041ddb.pdfIn PDF document text
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/4916208.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/3200440.pdfIn PDF document text
    • http://copytoshka.ru/linksys_wrt110_manual_espaol2s0rx.pdfIn PDF document text
    • http://terugate.mypressonline.com/fovugezusabuforejes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fe8ac8aad168.pdfIn PDF document text
    • https://kominuxopexazi.weebly.com/uploads/1/3/0/8/130814675/841d9.pdfIn PDF document text
    • https://juwexulomo.weebly.com/uploads/1/3/4/3/134385858/8868101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486997/normal_5ff229b037f8b.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/how_to_calculate_number_of_days_in_year_in_excel.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/8245503b-8473-439c-98a9-519310683d16/american_politics_today_6th_edition_with_access_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c7c5330-5df3-47c6-b078-493fee78f0ab/why_human_experimentation_is_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366cfd9f-03eb-4246-927f-7788be0efd78/43904836634.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_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 5416 bytes
SHA-256: 8787a4a22fd40d18915a226e2901d3bcf99fc3dea35cc3420e43adc713b4d230
font_01_sfnt_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 11728 bytes
SHA-256: d5e213ff8763ef096861c1c57c6ebfdc232eed8b6758bb142baf0f930acaeabc

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