Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f23098cabd399b…

MALICIOUS

PDF

78.6 KB Created: 2021-04-01 00:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cada1b94c0b4885f94f8c198fe6b0e13 SHA-1: 577efe7c23b527afb9f8fbe87498ed48c004961c SHA-256: 90f23098cabd399bfb8285ae2b9e7b932c4b43d093d4ff5340744477f3b775a5
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of multiple external links on disposable hosting supports this. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to drive traffic to potentially harmful content.

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://botokaw.ru/award?keyword=algebra+1+common+core+pdf PDF link annotation
    • https://joxegozul.weebly.com/uploads/1/3/1/0/131070165/4207983.pdfIn PDF document text
    • https://vunivejo.weebly.com/uploads/1/3/4/2/134266425/6a59429172ab5a6.pdfIn PDF document text
    • http://pupunorip.getenjoyment.net/the_strangest_secret_summary.pdfIn PDF document text
    • http://maximizator.online/65909158404gmcky.pdfIn PDF document text
    • https://cdn.sqhk.co/lizubenesowi/dfheKgc/pc_games_list_2020_offline.pdfIn PDF document text
    • http://dimebajurebed.22web.org/cognitive_biases_in_medicine.pdfIn PDF document text
    • http://varietystore.website/ninja_blender_parts_uk6geaf.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/SBgjiek/popiriwituboxedadamixo.pdfIn PDF document text
    • https://kasutuwisuruja.weebly.com/uploads/1/3/1/8/131872017/1d1ef5ebf4.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/1745e2.pdfIn PDF document text
    • http://wimesuzajomos.mypressonline.com/27458049597.pdfIn PDF document text
    • http://namsinc.info/572392195831dkaq.pdfIn PDF document text
    • http://lopegupukab.iblogger.org/wukepupokusupa.pdfIn PDF document text
    • https://vilinumatilaji.weebly.com/uploads/1/3/2/7/132740241/vevoraxopitikaf.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/jifojogowit.pdfIn PDF document text
    • https://cdn.sqhk.co/gomuwumetixu/gfIaihj/august_2019_telugu_calendar.pdfIn PDF document text
    • http://ogranicbio.fun/15279748516t28ho.pdfIn PDF document text
    • https://cdn.sqhk.co/binisomomup/iaWIgjn/movoboki.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/best_printable_heat_transfer_vinyl_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/jeBgehi/29213968958.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/aFmgCgh/pizza_chef_new_london.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lawesiwewif.onlinewebshop.net/magic_tree_house_book_series_age_group.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 5136 bytes
SHA-256: 8c4bccd0a43f6558d54c927257c00566ad199f6fbccbbc0d09043e292ca107d9
font_01_sfnt_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 10864 bytes
SHA-256: a4c1ea46ad43034a4b023ef28c1d5c0a57fd40614fafc0049227b825c8383a22
font_02_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 2072 bytes
SHA-256: 6604906041fe88dfbc261020bd84c9eeb32576ef8eacd169324117eca247b9cb
font_03_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230