Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cab089360e9372d…

MALICIOUS

PDF

76.0 KB Created: 2021-05-10 08:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3a022cf2e7d2926b65fd1e1b66472477 SHA-1: ef0cc36d1917584925b0df0184682d438c5fe165 SHA-256: 6cab089360e9372d0b76906a2740df4649a845d759dd4eef2b6117ce0aac4c39
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, suggesting it's designed to redirect users to potentially harmful sites, possibly for phishing or SEO manipulation. The presence of embedded JavaScript, though not fully analyzed, further supports the potential for malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/strik?utm_term=epson+wf-2530+printer+price PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fc7c363ece69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6059448332a24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417129/normal_604661c2219b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421781/normal_60368dae58b17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ff4aff5c1696.pdfIn PDF document text
    • http://rankingcoach-apps.com/n_thng_nhn_chu_doanh_wiki7bofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_603f3d2738b7b.pdfIn PDF document text
    • http://novonet.online/what_is_a_word_for_captivitywt5cn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390069/normal_5fccc67774b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_60209ac6b27eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_6049d31d687d5.pdfIn PDF document text
    • https://bavipakodotem.weebly.com/uploads/1/3/5/9/135958795/zesuxes-girisexelapo-ragixomajixatar.pdfIn PDF document text
    • https://baxukeze.weebly.com/uploads/1/3/0/8/130874478/senawesofekis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_6069ddc292d8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405950/normal_5fd145f894ebc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5fcea4457db8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_606c8a7ebb1f5.pdfIn PDF document text
    • https://dowusasetitemej.weebly.com/uploads/1/3/4/3/134307927/1156e722615e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387233/normal_5fe27ec015d66.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/4de6d5d3-dc9d-457d-8447-1b522b1f610d/what_is_electrical_outlet_in_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43951deb-0c42-44bb-aaef-870d67d4183f/76766432571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c55e8bc-1bba-4fb0-b620-07ec20f40056/wolumuwelixekeguxenaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4826fee-8aa1-45de-b33e-8f1ba046d0a2/94631910751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f1b8e4-8fae-46ad-9b4a-bf14b481a220/77105274951.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_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 5408 bytes
SHA-256: e7dcb96cd6302a65a75a0b5d486dd05717ae9f60a851638aba5a0175608cd0ce
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 11412 bytes
SHA-256: 7a2512739832f2809b68ca789962ed8560379a65ca6a61a17701118c5a96936b