Malicious PDF — malware analysis report

Static analysis result for SHA-256 de14473c3b4d9fcc…

MALICIOUS

PDF

77.9 KB Created: 2021-04-06 07:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 959850a9c48e8c540b16e4355a919054 SHA-1: e8fc9a3f3532be34b7ea2f9377d31629438c16a9 SHA-256: de14473c3b4d9fccbb13f0407707e8d1efcd8f651a0d5f873aaab83567e91b26
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains, suggesting it functions as a link farm for phishing or malware delivery. The presence of PDF_URI and EMBEDDED_URL heuristics further supports this, indicating the document's primary purpose is to redirect users to external, untrusted sites.

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://nipisod.ru/wix?keyword=macon+mayhem+schedule+2018 PDF link annotation
    • http://nususolajegak.iblogger.org/ragesotopegunemubimu.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/zodesudafexolonazekedasal.pdfIn PDF document text
    • http://mrt-zdes.ru/82231116588xg8k4.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/xigugibapokewujejovagodo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467277/normal_5fc95f130e408.pdfIn PDF document text
    • http://profyhouse.ru/26465990403a7c8t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_5fd7fb5955ddb.pdfIn PDF document text
    • http://infonewstravel.com/62528782643djy6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_5fd9c729c799e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5fe4e1a5d439f.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/hp_laserjet_pro_400_color_m451dn_paper_jam_tray_1.pdfIn PDF document text
    • https://sozaruterir.weebly.com/uploads/1/3/0/7/130738534/3624277.pdfIn PDF document text
    • https://navanelesud.weebly.com/uploads/1/3/0/9/130969746/301be9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feliruxitekul.epizy.com/81003319042.pdfIn PDF document text
    • http://monufaro.epizy.com/handbook_of_engineering_acoustics.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/jurnal_adversity_quotient_dengan_kematangan_karir.pdfIn PDF document text
    • http://livodubudo.rf.gd/19972596640.pdfIn PDF document text
    • http://jafuwada.rf.gd/risuwixaguxesogonapabus.pdfIn PDF document text
    • http://zawofepak.epizy.com/parasitic_arthropods.pdfIn PDF document text
    • http://nupatugo.epizy.com/68343672908.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_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 5712 bytes
SHA-256: 28a40c9a97506d1ecd023d13918f3563091202e5afc4c57be76b929e32d2356f
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 10964 bytes
SHA-256: 1998c436b84e226a0117742260ea3a9c0ea822a40df25d21301a73f2cd1a8189

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