Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55ee8a4cdef2f5b…

MALICIOUS

PDF

60.9 KB Created: 2020-11-18 20:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 04eba6e263de4731ddef392cb01349c5 SHA-1: ef4dc785003105377562d01f1f48cf93de65b054 SHA-256: f55ee8a4cdef2f5bb1183b1e45c4197599d110c2082e08bbb4ecfd1537ddd641
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits characteristics of a phishing or spam campaign, evidenced by numerous embedded links, including one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/123?utm_term=subject+complement+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f9c25c07312d.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/869970.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/sotorirazajedi-turajotatufa-rosuw.pdfIn PDF document text
    • https://sifurimunudop.weebly.com/uploads/1/3/4/3/134328932/parugudeguburo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5fb55caccfe06.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/fugebum_zejisuzeputug_bumuvokoponul.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/jovovasa-xuzaped.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f96c3aca7012.pdfIn PDF document text
    • https://kodupupagunoj.weebly.com/uploads/1/3/4/3/134314474/001fff40f29a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5f9d214291782.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/tizedeniluxiz-gefowigujotubu-senunomikale.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/potofaw/joindre_gratuit_en_ligne.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_off0000b254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB254 5436 bytes
SHA-256: be4c812092268a748c5df93f8ef837bb8d12d7ebf482a02fd07282b2736df9d3
font_01_sfnt_off0000c4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B9 10004 bytes
SHA-256: 576b5644f3a0039ea4913f31c0ae79cf7c67018299f7c42ecdd2c9cba5d1a966

Open this report in the interactive analyzer, or submit your own file for analysis.