Malicious PDF — malware analysis report

Static analysis result for SHA-256 21819ce0122e70d6…

MALICIOUS

PDF

99.0 KB Created: 2021-06-04 12:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0134d5be49d7a452fd2e6dd3584c3738 SHA-1: 7dd087dcbf6c69ee5294c5371df1914218d3f204 SHA-256: 21819ce0122e70d6c7b540e655ae0d7dd28b6d36c6bc60f4898088a716bc4565
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/pbw?utm_term=kiwi+fruit+facts PDF link annotation
    • https://velupilarase.weebly.com/uploads/1/3/5/3/135341581/gutezabimigogenug.pdfIn PDF document text
    • https://fofonameg.weebly.com/uploads/1/3/4/5/134522304/eae3c94f879002a.pdfIn PDF document text
    • https://fafogefefotal.weebly.com/uploads/1/3/5/3/135314601/piduxebaxor_furazumisazowa.pdfIn PDF document text
    • https://botugesoxa.weebly.com/uploads/1/3/4/5/134509905/1f6ebb2940a3bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_60582921349f9.pdfIn PDF document text
    • https://laganavixafalos.weebly.com/uploads/1/3/5/3/135341912/wipigizi-xesubaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413347/normal_5feefb3abf77d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407810/normal_5fc5bb6fee440.pdfIn PDF document text
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/12f19332d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416672/normal_60517a724314b.pdfIn PDF document text
    • https://xamolugasopiw.weebly.com/uploads/1/3/4/4/134468056/9334026.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/guxaw_gokel.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/7293012.pdfIn PDF document text
    • https://jozevupipe.weebly.com/uploads/1/3/5/3/135346753/284be2064.pdfIn PDF document text
    • https://poliradu.weebly.com/uploads/1/3/5/9/135991332/22383bd5c74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_604ebc8bf325c.pdfIn PDF document text
    • https://lizapomed.weebly.com/uploads/1/3/4/5/134511268/5859787.pdfIn PDF document text
    • https://gizepigonezes.weebly.com/uploads/1/3/4/9/134901759/nugunilu-bizepukiseb-runobo-kujumu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144476793/livro_400g_tcnicas_de_cozinha_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df6e4de-8a80-4f78-ae56-f2a203793e38/how_to_enable_flash_in_chrome_browser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aec22c2-bb75-40b5-8014-79950153f4c0/1392365940.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/16274646153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca7eb82-c818-4091-a39e-e85bee90f185/kerbal_space_program_buy_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0887d84-88db-4562-b8aa-6e33ffc431c9/xbox_one_controller_skins_custom.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/f/67864825213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adebae87-093d-4e10-987c-f14a68d52b90/best_sites_for_booking_accommodation.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_off0001321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 5128 bytes
SHA-256: 68a1945b2ac50d8785cd30061676c5e668371288bba89270301ebdbbc024f849
font_01_sfnt_off0001439c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439C 4904 bytes
SHA-256: eb1d938b16315ae08ed7e6fc52532e5b96c09e3422dcf6b23ee9931b089d52f7
font_02_sfnt_off00015474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15474 12568 bytes
SHA-256: a5be5770f93f81fc4fcb61ed214d822213e1915b5c312857ccc6bdc8b6a3796d