Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efccac0753a8278…

MALICIOUS

PDF

71.1 KB Created: 2021-03-16 22:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d9e92cb5dce9793dbe768a70d7edac99 SHA-1: 5837bd3554ea408f882c8cde9ce5b6bdb37238e7 SHA-256: 6efccac0753a827875e51206e25ec5168bc9fe91048ccf28997be746bbba1e6e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the structure of the PDF point towards an attempt to manipulate search engine results or lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/wix?keyword=best+ccs+study+guide PDF link annotation
    • https://cdn.sqhk.co/zamokaxu/lihfgh1/crazy_cookie_swirl_c_roblox_obby_model.pdfIn PDF document text
    • https://cdn.sqhk.co/lifupowaseli/Kwiahdg/43664345571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_604d44d743504.pdfIn PDF document text
    • https://cdn.sqhk.co/lekuruzomef/j1qxic3/55905632294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501380/normal_5fe309b35bf5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_6034f765ae6e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458145/normal_5fd966287f835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_604510942575a.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/piehjf2/digital_scholastic_storyworks.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449424/normal_5fe0373e2ff51.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/nolusepuzow.pdfIn PDF document text
    • http://punejew.mygamesonline.org/social_security_income_tax_for_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/ieLQiiw/wupiwizabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490950/normal_604dafcf66209.pdfIn PDF document text
    • http://joxezorov.mywebcommunity.org/anaesthesia_types.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_602039472e83f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_0f5a43ae202a4a00b51c03a8a23f9f2b.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_f40ae2da3c9c46eaaffc04357efeea2a.pdf?index=trueIn PDF document text
    • http://movasedumanepe.onlinewebshop.net/defunatarug.pdfIn PDF document text
    • http://fidalanono.myartsonline.com/89059631005.pdfIn PDF document text
    • https://c65a5dad-9bb8-4539-be9a-5f1b2cc6319b.filesusr.com/ugd/7ab50f_58fba81c43ba4bf99439fb2742b391fe.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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 4920 bytes
SHA-256: 5a7d592ae75ca8024926528dcde460d4454ddcd380b7d0958308d8f9a1a91b9c
font_01_sfnt_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 10788 bytes
SHA-256: cef2d0e2e64ff9af7614487540ac08db61655900af7192317dca8f1e219750a9

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