Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f32015e512fba8…

MALICIOUS

PDF

90.2 KB Created: 2021-02-17 20:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 54e9402be656482579d7cba0aa2bdff4 SHA-1: f6a9b10321a4523ed18dff775165c5af60b72f9b SHA-256: 23f32015e512fba889a3347a935c5d42112e9c3992a661e288bae2bf7ed71d8f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with a search query term indicate an attempt to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

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://seumenha.ru/aws?utm_term=is+hisense+led+a+good+tv+brand PDF link annotation
    • https://jokiwaxe.weebly.com/uploads/1/3/2/7/132740814/vegagidu.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/44999939276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_600b2b0e4da37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_6024856039ca4.pdfIn PDF document text
    • http://wssummer.space/disney_princess_songs_piano_sheet_music50t0m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_601bb4e3afd2c.pdfIn PDF document text
    • http://yatvoyya.fun/business_management_degree_jobs_in_healthcare92tf8.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/f3bf9c356.pdfIn PDF document text
    • https://lapawiniposa.weebly.com/uploads/1/3/5/3/135323982/ruxatiwubijeka.pdfIn PDF document text
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/3591329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_60174110c86b3.pdfIn PDF document text
    • http://apparentlyopt.com/free_simple_landing_page_templates1n58h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beviraveda.epizy.com/dream_on_glee_full_performance.pdfIn PDF document text
    • http://pewavifasovifuz.epizy.com/zepini.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/epigenetics_wallach.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/google_chrome_free_macbook_air.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/novojuri.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_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 5224 bytes
SHA-256: 10cf95aa0ac3f74bdea99bbdf69c40c665321e26024b9a35f47e50f64eaed034
font_01_sfnt_off00013627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13627 11096 bytes
SHA-256: 71733bdd5bd2cbd601561a8b8d2dff8d9df8118f63166c64db591bcf98639cd3

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