Malicious PDF — malware analysis report

Static analysis result for SHA-256 6978ba21fa0c54e0…

MALICIOUS

PDF

76.7 KB Created: 2021-04-03 11:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff36651eb0aaf67aa1ad9dba090bce02 SHA-1: 8ece92ef0144e4ab3e3871f3e365d167de614549 SHA-256: 6978ba21fa0c54e0519188a41e08f0ef99c761dbb3f1878c66e8590d38f360ec
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 0.9996

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://druttle.ru/award?keyword=pdf+splitter.+exe+download PDF link annotation
    • http://tuvivukaroj.mygamesonline.org/runamochaka_angaraka_stotram.pdfIn PDF document text
    • http://vexoxem.scienceontheweb.net/bigutu.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/62205442968.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/73801891280.pdfIn PDF document text
    • https://xarudaxukisa.weebly.com/uploads/1/3/4/0/134018653/138126.pdfIn PDF document text
    • https://posasuzu.weebly.com/uploads/1/3/2/7/132710669/ac990.pdfIn PDF document text
    • https://ritewelikuwu.weebly.com/uploads/1/3/4/4/134493798/7427852.pdfIn PDF document text
    • https://dubilovatigalis.weebly.com/uploads/1/3/4/7/134701517/moferujawozuviz.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/operations_research_and_financial_engineering_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/xanikadir/2ijggij/standard_ironing_board_height.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/A9o2hck/guilty_meaning_in_urdu.pdfIn PDF document text
    • https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/nozob.pdfIn PDF document text
    • https://savibivo.weebly.com/uploads/1/3/1/3/131381036/suzogutob_kilesigorul.pdfIn PDF document text
    • http://nukapag.getenjoyment.net/next_century_mathematics_statistics_and_probability.pdfIn PDF document text
    • https://zojujevekuki.weebly.com/uploads/1/3/0/9/130969212/gudemepipum_ravinivodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_a987844b14354011833f153fb02a3b77.pdf?index=trueIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/can_you_still_buy_nintendo_ds_lite_games.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_2d56ec683a5840cb888d99e72c02c850.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_2416555bf82846f4a934272288478ab8.pdf?index=trueIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/japize.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_d23bca56c9e84d57b1802802644b4ad5.pdf?index=trueIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_6de546c9140440058a6a40d20e9b31a4.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 5228 bytes
SHA-256: 6a9b4e5cf618d83955ebc26c3e1f0aa4bdb6e0eb7ccb70e46610bb3f29d174b4
font_01_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 10824 bytes
SHA-256: 47abaf1551444e8e058eff64c1aa5ca1b648b75956a429766d4ce3a9e6de2895