Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e14da37957c50f…

MALICIOUS

PDF

78.8 KB Created: 2021-03-05 09:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0998ac9bcebea301acc94be7c1bee920 SHA-1: 31b35af3231fd4908721b239d6b6aaedcb6984a8 SHA-256: 09e14da37957c50f4461d4770ecfe8ee1d51c78101ced42ca56e785d7d427f03
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document, potentially used as a lure or a distribution vector.

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
  • 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://jumiwimov.ru/strik?utm_term=john+deere+z425+hydraulic+pump PDF link annotation
    • http://procripton.com/winufesusosujirovab92eco.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444366/normal_5fe8914e7f460.pdfIn PDF document text
    • http://daduriwikoniza.22web.org/goliwudaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5fd19ab32a753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_6019fded8f1bd.pdfIn PDF document text
    • http://blankid.ru/bootstrap_template_for_asp._net_websitesbokk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_603ce6e56831d.pdfIn PDF document text
    • http://peludofnor.fun/2063658028816la5.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/gV4vij9/new_york_city_tourist_attraction_crossword_clue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528959/normal_5fef0df20a89e.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/jhtgfie/pop_time_catcher_mlb.pdfIn PDF document text
    • http://rufafepikawaj.22web.org/ikov_corporeal_beast_guide.pdfIn PDF document text
    • http://drilltech.info/julius_caesar_brutus_cassius_argument4h5vp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_fc28876e9dbc41efbe77f500ad919883.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_d7d98666959942bf9f4683ec3a83542e.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_abb29012d3fe4945ac47f3a9cfa0e27b.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_25d570c047c34597be399b626deaf229.pdf?index=trueIn PDF document text
    • http://merekum.rf.gd/latest_version_of_itunes_for_iphone.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_99e7ae6d43d1426ab4e793714601f7f9.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_fdde219c628a47b4ac37110f3bd93aaf.pdf?index=trueIn 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_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 5620 bytes
SHA-256: 44474d064c2b7617d3a124885813ee4bd8aef7d5abeea01ad3aedcd80455dc3c
font_01_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 10792 bytes
SHA-256: 432db5a39cd7141fa439ab59e097a28d6defec856228b10dfb836bca6c3d0af1