Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b690ba089c0af3…

MALICIOUS

PDF

71.9 KB Created: 2020-12-25 14:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2bd4bff6f57be3634266a8eb218e9afc SHA-1: 97c106caa7257905e0c6522a345174ffc63c0541 SHA-256: 24b690ba089c0af3f32b51aa90e5ae2404db0f5ea83bda24ececd4b99a66b29f
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector and disposable hosting domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution vector, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffmen.ru/strik?utm_term=rebel+ice+cream+triple+chocolate In PDF document text
    • https://cdn.sqhk.co/nanuvoxeva/RA76VRP/xomojosufowisawado.pdfIn PDF document text
    • https://puperoriwob.weebly.com/uploads/1/3/4/7/134715375/wigal_xedalot.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/3e75a4e696b2f2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476782/normal_5fdbaad1e4fc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493920/normal_5fcece253f57e.pdfIn PDF document text
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/wibireligov_jatoragijumali_filirarumose_netupamefekubux.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/zitevixazezawi.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/d457194b-7475-4973-8893-49a701446303/sumilexotesakez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10d7824-f903-40a3-b163-9821243b8a4a/su_florcita_la_banda_de_lechuga_de_m.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2573e510-de93-4596-b913-7c9750296caa/96082973140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb55486-034f-4b0d-83ac-b00aaec3979c/top_10_selling_singles_of_the_70s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67e6fa5-cb4d-44c0-a382-40529e8c14e7/lafuxizulojas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f790f6f-6ea1-448c-8dae-a1cc01bada98/99795055458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61eaba6a-18c6-4c82-8775-8a92b558642b/23344110989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97778b7d-f648-4f36-add0-572ec8e3a5a0/who_studies_all_forms_of_life.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_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 5144 bytes
SHA-256: bf0e599cf84aabcd0a594fca68b2ee7c41cc8f67b01e3118e08bbde7a7221942
font_01_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 10324 bytes
SHA-256: 38641e8cfa464c1031e71b8e9517fe7e87669168c237d4d477bbe87013400244

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