Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc948b67250e504…

MALICIOUS

PDF

83.6 KB Created: 2021-03-09 01:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6d5e6895659de32b119b815190d23aac SHA-1: 183e5c89f62ec61d176aa890cabd628439442488 SHA-256: 6dc948b67250e504f6f4df92f7e1a3ad69962bd6584a8919e7fa7c8eabf0c96e
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least two pointing to suspicious domains that are likely part of a link farm or phishing operation. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to manipulate search engine results or trick users into visiting malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://leonvi.ru/award?keyword=caracteristicas+del+enlace+covalente+pdf PDF link annotation
    • http://filfex.ru/watinonuwomezuz1kys.pdfIn PDF document text
    • http://triple-doska4.club/camera_eyewear_v13_manual0ob7i.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/66495865139.pdfIn PDF document text
    • http://ita-talia.fun/how_much_money_do_psychologist_make_an_hour9mijj.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/65899836441.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/22832183904.pdfIn PDF document text
    • http://mejumafegebameg.mygamesonline.org/42619865118.pdfIn PDF document text
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/wakapamuwus.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/fufumuxadisatuj.pdfIn PDF document text
    • http://mybiol.site/easy_at_home_smoothie_recipesoloql.pdfIn PDF document text
    • http://lifeit.pro/libro_de_cimentacioneslh5xw.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/vugixa_wukanag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://judiserod.onlinewebshop.net/myers_briggs_personality_types_explained_-_which_one_are_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe017aa-af23-4313-a4aa-4df886abbf7a/trigonometry_formulas_class_10.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_5d946beb204b4c8d97528fac9f2a95df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26929109-c330-43f9-a4ce-acf691bc8b7b/vonozovakalolivawemotofu.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/history_egypt.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_fad5b941449b4223b0de1d2dcb69ee69.pdf?index=trueIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_06df270bb4d84a7a91f0a769153bb723.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0398fa-f0e5-48f7-b45d-d2974cfff091/79732778008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603ed528-a371-48bb-a0ef-7b7082c054a3/2015_international_prostar_warn_engine_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5405c3e-cb0a-46bc-a780-63fa39d1f89f/raymarine_c120_chart_updates.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 5116 bytes
SHA-256: 5b4eb2ac339c5a00ae0522d737a78c1d63ed948e21aed725506ae8ce5e5e7d61
font_01_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 12180 bytes
SHA-256: 0ebbad043a11821f3a3bb0183172fbee487132d25fba0b2a54b1ca6881e62dc0

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