Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ccecaee2aafd5e…

MALICIOUS

PDF

73.8 KB Created: 2021-01-09 06:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c90d29907116b85f3132de28930d5898 SHA-1: ea87f37387e29e72b01a0c9c665b4f4dc8ec7459 SHA-256: 18ccecaee2aafd5e43621e27d87699a687a4080b495492c49ada67f61c8a1db1
214 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, with one URL explicitly identified as a malicious redirector. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were extracted, the embedded URLs and the PDF structure strongly suggest an attempt to lure users to malicious sites, likely for phishing or 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
  • 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.
  • 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://gettraff.ru/123?utm_term=sue+multicultural+counseling In PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff336bb754f0.pdfIn PDF document text
    • https://dodimugu.weebly.com/uploads/1/3/4/4/134483739/mukitewekawago.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471106/normal_5fe559f252d7b.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/4jgdzWj/40977893620.pdfIn PDF document text
    • https://lisamotakix.weebly.com/uploads/1/3/4/3/134308999/3d757c201b86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_5f97576164375.pdfIn PDF document text
    • https://cdn.sqhk.co/nexokefad/Vjdhfih/zumoxemugogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/sqlite_studio_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/flash_s_bounty_game.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/gexutabuxutijujugupikeje.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/articles_all_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/tasotewajufowo.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/images_of_gibnut.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/2004_tl_manual_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/arlina_blogger_template.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_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 5220 bytes
SHA-256: 590f53e2faa736c4ca460089ce49ff5f4dfd18a9280a4c2ecea9f1c4857cc1a2
font_01_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 10836 bytes
SHA-256: f23a7eb8819fc1f27a05fecd809048b2a30487fa6bd79497f49a8e66be1150fd

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