Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8aa3b145787f5e9…

MALICIOUS

PDF

89.1 KB Created: 2021-04-01 17:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c1cf9c8467bd89a9331d5ebab1f4ccbf SHA-1: ace0f74aea20ce2d2d288768d9dfe48888f835b3 SHA-256: a8aa3b145787f5e94f8d5ca23d8f84b7e9a58656feddfd01704b5ca6053d3a9b
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 0.9996

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://zajinet.ru/wix?keyword=future+fight+ctp+guide+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454821/normal_602227dbcad3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_5fd77a15b60ce.pdfIn PDF document text
    • https://xariwavunulopex.weebly.com/uploads/1/3/1/4/131406448/jorud_bizilo_wiwukufaj_pibupevof.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/sopunoviketafalez.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/barovuzomijuna.pdfIn PDF document text
    • http://gosunenibunale.getenjoyment.net/53506184322.pdfIn PDF document text
    • http://fevevafo.medianewsonline.com/38235942274.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/82215483548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444884/normal_605451cb4d069.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/9166367155.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/nadul_jazajo_juvetakejera_lujuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422137/normal_605f9d423a711.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/9a6073f4-8ff5-4436-8f22-3c4edcc91693/book_of_the_secrets_of_enoch.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_f6b384fde83e4fdb9ab8cd6cd26ee3f1.pdf?index=trueIn PDF document text
    • http://vutogebufuz.myartsonline.com/lejadetaruxaji.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_218543018eb84a0db00a7f74508d0ce0.pdf?index=trueIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_c80380a5c30247dea8dd9a807639dc1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8374b3b-a82a-4c32-a902-cd29ddf4dee7/39248514351.pdfIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_48ea9aa1b6954e129ca34e5061b2c277.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
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 6476 bytes
SHA-256: 6b33ff188d28154d6dbdbf812d80b7b44c2f9bc5adfe8bd5e5c9793c1c79fec7
font_01_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 5224 bytes
SHA-256: 0ee250009766e3f3ff094c48a5b44d00e1e4a4f4fa694130139c4ea3592d7673
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 11156 bytes
SHA-256: 6f0f3deda19d5c0b5066d763abdc5c61c80cc07499e6643f20b76738a8dfc365
font_03_sfnt_off00013fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEF 16136 bytes
SHA-256: d6e3b2b7ceca900ecdebdd25d367bcc6d62774f53ab7ff9db2f1210cd1c60194

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