Malicious PDF — malware analysis report

Static analysis result for SHA-256 989540ebfdc1ac0f…

MALICIOUS

PDF

82.6 KB Created: 2021-05-09 15:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6d77f73431cd138d706b23371c7db5ca SHA-1: dd3bb68861c3f6abf4bf6ab9afdad02066bc9e1f SHA-256: 989540ebfdc1ac0fed539f39c0621d270f4b8675fe7cd0166bf3158be97bfbfc
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, including one to 'maypoin.ru' which is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a tactic to artificially boost search engine rankings or distribute malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://maypoin.ru/strik?utm_term=work+and+energy+physics+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384142/normal_600a7c5da940e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473340/normal_5fd7a8419cf68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385217/normal_5fdefa72236cd.pdfIn PDF document text
    • http://repochka.site/bailando_espanol_songqtw26.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/n53agcS/deezer_nextbike_berlin_kosten.pdfIn PDF document text
    • http://wspring.space/28772475855dapti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475720/normal_6046732c489f3.pdfIn PDF document text
    • http://lighterusb24.site/which_is_better_jbl_charge_3_or_flip_5lnwyf.pdfIn PDF document text
    • https://cdn.sqhk.co/lemipetukaso/OmUjjij/responsive_website_mockup_psd_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/ge8ooy3/folder_sync_open_source_alternative_to_photoshop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a82c0f4b-2568-4a2d-8f0c-72e96307e6dc/63940656627.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_195c7e22ee23449388f85efdde4bffdb.pdf?index=trueIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_28eb12e3da0d4cef853cdc9fb0592e4b.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_a10b431d691c4d8aad3da7dff3090e6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ff97c2-bf40-4058-9f2d-cac8d6566927/33188279330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf029587-283e-4b7e-9f6f-799432c3688a/how_to_clean_krups_cappuccino_machine.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_c15a3bb8712e47ffb1dde50306a52388.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_4f19f9f1bb734a4390056ef3f6b13ff0.pdf?index=trueIn PDF document text
    • https://71b34470-2e60-4936-811b-9f14cb47e32b.filesusr.com/ugd/1dbbf0_8bc269e582ce451b96e118dbfa7b13fd.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_0604cccb9ac04909afc63522a96236b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/176b4a1e-79c6-4812-9aef-cafb03c05d28/mavelajetewebivonoxit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a02a3a74-8c7b-4c25-908d-11c4cd8a9ec9/14769005669.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
    • 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_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 5360 bytes
SHA-256: 25168af5b1a99ff24a86abbf4a0da5df0888974af65d7f264c6cdb3510bb3d81
font_01_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 11104 bytes
SHA-256: ecf0f50b446c52b6e8b89b00599e1d003ac1040e5b636527cef8a19c4805c027
font_02_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00012e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E60 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.