Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04beeb5792fbc52…

MALICIOUS

PDF

82.7 KB Created: 2021-05-03 04:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f41d7df38db8bb6c94b81260404c1822 SHA-1: b014b550a6d566107125997fe806c3c2d0f03657 SHA-256: d04beeb5792fbc522d28f9357afabe46dbc3e6201d40231f57e2bc6ccbe3be66
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

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://ponafet.ru/strik?utm_term=mean+median+mode+range+outlier+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/zixagiko/idOgg2O/mbta_mticket_refund.pdfIn PDF document text
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/b993a7b86.pdfIn PDF document text
    • http://vuvabadiredowa.getenjoyment.net/pilot_aptitude_test_books.pdfIn PDF document text
    • http://cethq.xyz/kenneth_wuest_new_testamentk0x7w.pdfIn PDF document text
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/manorajazoz-xivogupuva-dufijibo-muwalaru.pdfIn PDF document text
    • http://magicwoolshop.com/rimibunefutikim4n6.pdfIn PDF document text
    • https://zegaxazidunuxe.weebly.com/uploads/1/3/4/7/134746987/medezukiviwadot-wukazik-wuzepide-nakijenodise.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/macbeth_act_2_scene_3_translation_to_modern_english.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/what_happens_in_the_poem_remains.pdfIn PDF document text
    • https://pazaduzot.weebly.com/uploads/1/3/4/4/134473777/toxelipoken-wuxuxupiluwamil-kepevujit.pdfIn PDF document text
    • http://realwockyc.info/saluxinukotifupotosas4435y.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/11083763284.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/cUje7jb/4740435392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1d9841-6a10-4fbb-92c0-4cadc1542182/82970296927.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/17633498937.pdfIn PDF document text
    • http://joberemig.atwebpages.com/54818783883.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/85405750234.pdfIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/ahmadiyya_pocket_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d9f702-8690-4ff4-9587-1ca95909e8a0/41108978765.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_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 5616 bytes
SHA-256: d1755e5a017fac7608e35ba3201f5e5df0786cd3870bb797b45a6cb63fc80998
font_01_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 11304 bytes
SHA-256: 4220a77a3db17a925b826775a025c834b9ba6fc168d5caf56d2b5a6f0428d876

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