Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18e68dc5bde13d1…

MALICIOUS

PDF

85.7 KB Created: 2021-02-20 00:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8147765f6f65c051528eed5c8788810a SHA-1: c7dd1b8d842c5691e50aa3460c6073fa0dd67931 SHA-256: d18e68dc5bde13d1470fe4053dab00e076c1bec36b95d65d421270efe0030308
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a domain associated with phishing and link farming. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external URIs and the overall heuristic firings suggest the document is designed to redirect users to malicious sites.

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://maypoin.ru/wix?keyword=descargar+halo+evolutions+espa%25C3%25B1ol+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384295/normal_5fc71a85e0bce.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/0df15a97391266.pdfIn PDF document text
    • https://nudatisuwirok.weebly.com/uploads/1/3/1/3/131384101/9281975.pdfIn PDF document text
    • http://triple-doska1.club/zasojizumizavalaribemb1qmw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452837/normal_6004bb934c05a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_601834ef0299b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_60183cdfbab37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5ff0754fadd12.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/lufunawoxas.pdfIn PDF document text
    • https://giwizakewat.weebly.com/uploads/1/3/1/8/131857916/3827393.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sonatalub.epizy.com/boolean_logic_cheat_sheet.pdfIn PDF document text
    • http://nixaruxabonijiw.rf.gd/sahih_bukhari_volume_2_page_185.pdfIn PDF document text
    • http://pamiwumewamem.epizy.com/25781711714.pdfIn PDF document text
    • http://sovezogodum.rf.gd/expression_web_4_html5_templates.pdfIn PDF document text
    • http://menasore.epizy.com/enthought_canopy_python_2._7.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/caballero_alejandro_fernandez.pdfIn PDF document text
    • http://xomedejufe.rf.gd/formal_letter_complaint_about_school_canteen_sample.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_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 5568 bytes
SHA-256: 734f58d5fa9eb7f50c40912af41fe3065b24da4198beca6ec37d15cfaf266033
font_01_sfnt_off0001156a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 10620 bytes
SHA-256: 96db6f1086ea18709e7c1a3f8b1766e79319478867874a23c0ac576d879785dd
font_02_sfnt_off00013951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13951 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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