Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5eb4654af38165…

MALICIOUS

PDF

75.2 KB Created: 2021-03-24 07:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c082148f921b2ac38e062bd30f0e47fa SHA-1: 6b74fa0c755c1b7ee9e5033b09c94794a10111e1 SHA-256: 2f5eb4654af381655bfff76a58ddabd211e4dd13b153f38f60220d9203778447
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=carl+painter+guide+service
    • http://fipagolanikobax.mygamesonline.org/ziwav.pdf
    • http://nosumiva.mywebcommunity.org/kuzigesoramefena.pdf
    • http://jofarofuwudeveb.66ghz.com/el_ser_uno_arcanos_de_thoth.pdf
    • https://cdn-cms.f-static.net/uploads/4454055/normal_6035d9637b84d.pdf
    • https://gulapizebulo.weebly.com/uploads/1/3/1/0/131070336/sulobirejavizoxu.pdf
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/1193774.pdf
    • https://puxezemugip.weebly.com/uploads/1/3/4/3/134311794/warunot-sivovozopopinu.pdf
    • http://nukels.xyz/15348737594z234c.pdf
    • https://cdn-cms.f-static.net/uploads/4467927/normal_603db3d25a655.pdf
    • https://static.s123-cdn-static.com/uploads/4459628/normal_6000bbb2bced4.pdf
    • https://pafovawulawagi.weebly.com/uploads/1/3/4/5/134581771/kotakusaxuz.pdf
    • http://acupofjacob.com/78227674545e9cya.pdf
    • http://jokojujut.medianewsonline.com/autor_del_libro_curso_de_milagros.pdf
    • http://idealslim-ordina.site/gigakisebumakijepojorofe6spsj.pdf
    • https://mujoganik.weebly.com/uploads/1/3/0/7/130776873/kafep.pdf
    • http://dipazekonowa.mypressonline.com/english_english_tamil_dictionary_free_download.pdf
    • http://gugibugud.mygamesonline.org/oxford_discover_1_vk.pdf
    • http://pinerapidsrr.com/musuxoduoop4z.pdf
    • http://airet.space/rizivuoogyh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a88e3acb-60ab-45a7-b176-ec21a52ec64f/adt_scw9057g-433_installation_manual.pdf
    • http://pusevim.epizy.com/12908300638.pdf
    • https://uploads.strikinglycdn.com/files/16e3a890-5471-4d0e-a493-c6c15a3d4b4f/united_states_war_history_timeline.pdf
    • http://duzudolaboxu.rf.gd/glock_conversion_kit_legal_in_ny.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fe.bin
644e4762b9a182ce2184720b627c5622a1852f83b839e042549f7f9f740f1893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 5208 bytes
font_01_sfnt_off0000facb.bin
22c24b22513e898cf059cd2599c03861557dc280aa5929416e91d7f7e187e7a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 10684 bytes

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