Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bae4870630a0c4…

MALICIOUS

PDF

80.7 KB Created: 2021-03-14 23:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c3d597f89412329cbfbc76c6da129906 SHA-1: 94d261445f8d5af6fa8a3539b35c4740c244978c SHA-256: d1bae4870630a0c40ce8ded3f84afbad231f3a7fa38839361017b4a7410d869e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/wix?keyword=write+a+letter+win+a+house+deutsch PDF link annotation
    • https://cdn.sqhk.co/bosareke/ggghahi/vuken.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/Iuiic8j/bang_bang_bang_korean_song_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/nifemifufeju/H5je2jd/arctic_animals_worksheets_for_preschool.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/bDOghSt/business_accounting_classes_near_me.pdfIn PDF document text
    • http://nusururak.22web.org/what_is_meant_by_void_contract.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/eij0Er2/city_runner_stroller.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/ghEiahd/55978360642.pdfIn PDF document text
    • https://cdn.sqhk.co/rutesawir/wp9jehg/mexoxazirojepegi.pdfIn PDF document text
    • https://cdn.sqhk.co/nububufi/f4YFiho/dinosaur_drawing_easy_steps.pdfIn PDF document text
    • http://zatodawu.iblogger.org/zojemile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aad5034-058f-4c16-8588-804545bf064c/bogewebowujuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e31205-a25b-4d39-a6ba-efa36481a30d/chevy_p30_step_van_gvwr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0492a8ab-9fee-4984-b91e-fa6425b35c91/88792644496.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_41a73fd1f5024daa845bc684fa3f517e.pdf?index=trueIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_4237c83ef48042f88bb3a19a18bc4786.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_e37d9d2639ca4f60a8415188e5207f40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d969157-c7cd-4d54-b092-f4effbd7ffb2/52123859375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4279a5cd-5072-4488-8873-68467187f89a/haydn_trumpet_concerto_3rd_movement_accompaniment.pdfIn PDF document text
    • http://jusekajuno.epizy.com/26353316969.pdfIn PDF document text
    • http://sivawilowun.rf.gd/potomifiwilepapubewema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04325d1-2788-4109-99c6-45f33ce22e66/stihl_fs_130_idle_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea29b70-cf58-4b5a-a256-cf28f242a33d/zewat.pdfIn PDF document text
    • http://lubozogemodusa.epizy.com/visumokifaxekilagubonek.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_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 5132 bytes
SHA-256: e40a25101f666bbe3f88d25bfd571b5d53ac17dc846df78c528edb93d386828b
font_01_sfnt_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 11004 bytes
SHA-256: 40c0397af24e567650a3c76aa66032cc26ce6c872f1be48ff1ecc759dad2f8d9

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