Malicious PDF — malware analysis report

Static analysis result for SHA-256 efad2e1dc0486566…

MALICIOUS

PDF

76.1 KB Created: 2021-03-24 22:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f22590cd314adaab14f387049164f4ac SHA-1: 520787eaf5638bbfbbf84cc2b822636d2e301674 SHA-256: efad2e1dc048656623b20df039f60babfef1bd16bb9a316f73d363afcce45056
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using many redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/award?keyword=curso+de+caldeireiro+pdf PDF link annotation
    • http://erogan-encolumbia.site/wordscapes_level_1822_answersn0u7y.pdfIn PDF document text
    • http://mexicotop3.xyz/48226144151bvzjf.pdfIn PDF document text
    • https://nerupeke.weebly.com/uploads/1/3/1/4/131483009/2255333.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/libro_biocentrismo_di_robert_lanza.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/minolta_srt_102_battery.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464739/normal_5fed061c733b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_6035c6b57fb38.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/buvakapifiriloli.pdfIn PDF document text
    • https://rotisozag.weebly.com/uploads/1/3/4/6/134679288/6971028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_600a1ed518ad5.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/wivutazafapetujeko.pdfIn PDF document text
    • http://libralab.digital/britney_spears_circus_albumondpc.pdfIn PDF document text
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/tuluru.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/lisodidekuzupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5fd74fc392a00.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/kozusegev.pdfIn PDF document text
    • http://buyfastedcircle.xyz/ruvesagebixaniohe29.pdfIn PDF document text
    • http://am-sound.ru/139798200270uajg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379221/normal_5ffcabffd5e3a.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/90209280355.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 5052 bytes
SHA-256: 1ba25a0a99289909739c37f307f4bd89f2de3f4afb9948031212b8ffbc57a203
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 13780 bytes
SHA-256: b7fb2b1a9b65e3a0582cc1a925c8bf447935e2e889afb464b0024b5efdef14a0

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