Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd118b19d76581f…

MALICIOUS

PDF

78.5 KB Created: 2021-03-10 00:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f9334f46ce1dc0845777796678dc869e SHA-1: 2802acfd0f852856211e03dacad2e5da119e3252 SHA-256: 9fd118b19d76581f9a5bc795f3b818356d7d0ffec7f26c9240153fc90ed4c921
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

Heuristics 5

  • 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://dugedepap.ru/123?utm_term=adverb+form+of+adjective+hard PDF link annotation
    • https://cdn.sqhk.co/zusisoko/hcnhahd/74497631125.pdfIn PDF document text
    • https://cdn.sqhk.co/davusegeb/oqWhaZb/55387899719.pdfIn PDF document text
    • http://kulinar2020.site/las_cronicas_de_narnia_el_principe_caspian_onlinets3k2.pdfIn PDF document text
    • http://fly-drive.online/52717924709lesou.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/actron_cp9580a_vs_cp9680.pdfIn PDF document text
    • http://prod-fruit.space/addzest_max950hd_manual2s4e7.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/99477e4d7.pdfIn PDF document text
    • https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/rufusi.pdfIn PDF document text
    • http://yatvoyya.fun/829921406609wqvt.pdfIn PDF document text
    • https://vinaxana.weebly.com/uploads/1/3/4/7/134725794/53fa7464d6.pdfIn PDF document text
    • http://cosmostil.top/wejimukazujonivuxuwerzbp.pdfIn PDF document text
    • https://cdn.sqhk.co/nogegamapagi/hjhKrib/td_bank_brooklyn_ny_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/gixenako/Q4gfagc/pictures_of_cramped_office_space.pdfIn PDF document text
    • http://furniture21.online/favirubezetufopzw.pdfIn PDF document text
    • https://cdn.sqhk.co/lediname/HUPjfhi/97145899941.pdfIn PDF document text
    • http://profyhouse.ru/the_endless_summer_1966ssqk5.pdfIn PDF document text
    • https://cdn.sqhk.co/wenisuvuroju/WRiggjv/wwe_network_free_ppv.pdfIn PDF document text
    • http://bobr.space/lirusijitijei3wb8.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/general_to_particular_example.pdfIn PDF document text
    • http://newsportstechnology.ru/how_to_convert_png_image_to_jpg_on_macfwmbz.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/8R93W3p/10083673804.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/hLbwzIS/sedajudekawenawup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezefaxovojole.atwebpages.com/pdf_to_word_converter_app_for_windows_10_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 3284 bytes
SHA-256: 7485202577b6302732a3044a3bbc8ff70e6aaa924ac8abf840ee42d4c7554245
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 5316 bytes
SHA-256: 9aaba902669d3f32052aab1e40a238e030cd06274379721b629a6b84e29c3c21
font_02_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 10588 bytes
SHA-256: c7488858cb713dea5486620d4cdda88e4f0ee14b2babc95ada877fafedd4e990