Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd21ed039ad2cde…

MALICIOUS

PDF

76.2 KB Created: 2021-05-25 20:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5bfa221c947cd6ffeb9d02e6694d7dd4 SHA-1: 1120e0e3eada0033d14355dcdb30867f48d121a7 SHA-256: 5cd21ed039ad2cde417477c00a4379ad516348bd8ec5e151bf01dbefea7049bb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The primary URL, https://jumiwimov.ru/strik, is likely used to redirect the user to a malicious site for phishing or scam purposes. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or malware distribution.

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 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.
  • 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://jumiwimov.ru/strik?utm_term=%25C2%25BFcu%25C3%25A1les+son+las+caracter%25C3%25ADsticas+de+los+5+continentes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404753/normal_606b8edb0c04f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_604fd4ea942d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419851/normal_60064f4203857.pdfIn PDF document text
    • https://bilezebije.weebly.com/uploads/1/3/4/3/134344171/dunogumil-loguxuluguguris-vimibije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_6020fb65ac0b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_6041b0804720b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_6052824a892f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_602454dd0f4ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415544/normal_603974108fa64.pdfIn PDF document text
    • https://duvozogol.weebly.com/uploads/1/3/5/3/135314926/dozegusi.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/kotodur/brooklyn_nine_nine_season_6_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/norelco_aquatec_replacement_blades_hq8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea9561a-9223-4f85-a406-c96c5a72dbb0/62066198668.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/87043485865.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/best_app_for_rhyming_words_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/the_cat_in_the_hat_book_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/lax_max_new_generation_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb48aa2-0a40-41a1-8357-1934897a5373/husqvarna_455_rancher_18_chain_size.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_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 5384 bytes
SHA-256: 406cd067b5ebf5cbdaab98e340c63b45cc7ae6027e53548fa483bfed8ea1e942
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 11208 bytes
SHA-256: f6436d67780386a15cb5999ecbc2e552086bfee815a2b2f4c5df4ff9a971cd06

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