Malicious PDF — malware analysis report

Static analysis result for SHA-256 38819f951eb7cbce…

MALICIOUS

PDF

82.1 KB Created: 2021-06-07 05:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 85906a4cd497e54de6167091ce0f77a0 SHA-1: fdd3ade5af66246e0d20d8141183800292fc542e SHA-256: 38819f951eb7cbce4689f019f150b58d4aec2b796a9346851444cc8ca8eca9fb
66 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 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 0.9998

Heuristics 4

  • 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://crewmak.ru/pbw?utm_term=libro+conecta+mas+matematicas+1+secundaria+respuestas+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4504791/normal_5fe3f9c358015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5fd34b78eca8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_6050f142dfdd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470979/normal_6004d6f77fb24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471971/normal_5ff0a5ee3b293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_5fd962ffc1b7f.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/080eb0f8-ef88-4b7b-8dc4-abd40eb8d4b4/beat_saber_custom_platforms_1.13.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/gumtree_belfast_pets_birds.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144668247/12002555630.pdfIn PDF document text
    • http://nowefuro.pbworks.com/w/file/fetch/144562461/soxirowunojutituzibakon.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/w/file/fetch/144662199/65854493873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b1e2fd-61f1-433f-8f19-a111f95665e7/butatetisinevatoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f5b333-81ed-4eb4-9a03-2677c3805024/dofot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b803300-f644-481d-881f-ab25ca870d76/dish_wally_wi-fi_usb_adapter.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144435123/derecho_internacional_pblico_libro_monroy_cabra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/849b18ba-ba1e-4e66-bdf6-d842cc25d837/how_long_can_baby_use_arms_reach_co_sleeper.pdfIn PDF document text
    • http://lerepaxa.pbworks.com/f/multiplication_and_division_of_exponents_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b74316c-ff60-4175-9417-34889e1e111c/54468364423.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/f/2_ejemplos_de_epilogo_cortos.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 5404 bytes
SHA-256: 8f8a190c58e4f3003ff4ea60c675cb0d4d58010ed2431944251953690f6dc2ac
font_02_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 11680 bytes
SHA-256: bf55bbd242d25d100d112d6bb580872a36af5788798561f285459f833376264c

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