Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b1a8795777abd1…

MALICIOUS

PDF

104.1 KB Created: 2021-09-17 18:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eec25afd60b1df3f1dc564803298b7b9 SHA-1: 2bd36e98342a1c97968c3a83ba44144eae0b2a04 SHA-256: d4b1a8795777abd15183036250035b29da1c71f04fa85f8f524c0ec25b4d6e11
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URIs, particularly those hosted on disposable domains, suggest an attempt to redirect users to malicious sites for phishing or further payload delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm designed to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=olsh+randwick+launch+site PDF link annotation
    • http://aotwresort.org/ckfinder/userfiles/files/41701542247.pdfIn PDF document text
    • http://imi.vc/upload/files/palipufofuwagukipi.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/36034204093.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/74488228167.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/solugoxosukafivedexu.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/pewepag.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/19791324249.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/14153873864.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/ludonodovexalisukoraz.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/toxixebevosudixejuvonop.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/14377765431.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/zeforofunowobotugewikepa.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/zevujixapawogodigoxeji.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xupezizemefamolasira.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/sipavudetivibuxiriwagonu.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/75004312670.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/sefixonodozutofozorol.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/ruxefanozepudunere.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/37731872207.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/9496294972.pdfIn PDF document text
    • https://everestart.com/images/stories/file/93901648736.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/16859731187.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/79444221581.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13415 17836 bytes
SHA-256: d17cfd731d001581ffecf8812093636182296cf9ea361a262c970ce2f75927c6
font_01_sfnt_off00016247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A5E 10648 bytes
SHA-256: e5112c714f2bd07d536ef985fc65210b936a0f0ff7643a7436d040b0fa190f57

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