Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a540b72cbeb852…

MALICIOUS

PDF

80.5 KB Created: 2021-02-20 02:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1bedc21153e30e61b11c59b86628f0c8 SHA-1: 2d8e29a5779c3071222f06aa906e12b415243111 SHA-256: 27a540b72cbeb85275bd174a542729df31fc2d61dd6b34c55a66ce516a3857ce
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and exhibiting UTM parameters, indicative of a phishing or redirection campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish credentials. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=key+west+margaritaville+machine+recipes PDF link annotation
    • http://poradoit1.site/akira_2016_kannada_film_songsz3moi.pdfIn PDF document text
    • http://prizyivnik.ru/25582942540oli1j.pdfIn PDF document text
    • http://musc-media.xyz/950005476253rsy7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388183/normal_5fdca79acb8bc.pdfIn PDF document text
    • http://songkfrk.site/galvanized_iron_sheetjr5ku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_6028d095cbf4d.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/hgWpngo/pilumijupapizilaredup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kufazete/86401105449.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/telugu_movies_2018_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/botanica_geral.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/xaseluvalazuxe.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_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 5572 bytes
SHA-256: 9cfb357e758da4542d52760a48651d0cd45c7d9d9ee1ec4295b5a12395b96a9c
font_01_sfnt_off00010c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 11980 bytes
SHA-256: 9e234d4c9716a2c674fa916b922a21a6771f360c24cdb98f073e3d1c81bac77c

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