Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de441a99ff6c5e7…

MALICIOUS

PDF

77.4 KB Created: 2021-03-26 08:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2396c6d08965101cdd21a77991875a99 SHA-1: 5ed72d41c13d73c39be1b88c1c57b40b21467700 SHA-256: 5de441a99ff6c5e753a77a815f7944cfb65d3e740146d7e89d9f353054c89fe8
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 hosting, and is flagged by heuristics as a link farm and a phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

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://lozipotod.ru/award?keyword=statistical+methods+for+categorical+data+analysis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383571/normal_6054b5421995f.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/i8b0IAw/52413290725.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5ff20d14cc28c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_6046ae1f4a113.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/APSjhQQ/nitezixinavekikujukogif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495846/normal_5fc7f63304dfc.pdfIn PDF document text
    • https://cdn.sqhk.co/kopubeno/j0DDxgf/lagojemir.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/oghPynv/nails_near_me_open_saturday.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/62de7d18-cb3e-48a9-a417-f409df7c4b46/96089565139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/686953fb-7cba-4589-9f85-01fcca8395e4/advanced_organic_chemistry_arun_bahl_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f247bc9a-5cdf-4464-b6dc-f62d1873db7f/saga_rules_1st_edition.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_bc4cd5d9c2be412b8c3daa420010426a.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_f9ce0f696aa5452b8f6a3a337af5c493.pdf?index=trueIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_1327c1091c5945f4937f29dc1fae3927.pdf?index=trueIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_e9233b73202c4c2eae7394c7131faccb.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_2aa10d3030c542bd9f55f0b6628efb8a.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_223ef7a522cd4f51af676da773246d63.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 5564 bytes
SHA-256: f1a01bd17b5409d0b83eab2c68cee170a1b6da0f5ca322d69a581751cdca00f7
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 10852 bytes
SHA-256: 333368eb5dca662081bb467f404cf5cce6a85ad1ed698d33ab4e68409618143e
font_02_sfnt_off000119d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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