Malicious PDF — malware analysis report

Static analysis result for SHA-256 272e784cd5d6067c…

MALICIOUS

PDF

71.9 KB Created: 2021-02-20 09:38:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 49882dac86badd75fb5fbb834b02f6c8 SHA-1: 59949f7a913445c836a8f7587008e54761032103 SHA-256: 272e784cd5d6067c008baea664811a3fb36f1dc9c028ad223c9122d07be5c303
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO link farming. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a malicious intent to redirect users to potentially harmful content or to manipulate search engine rankings. No scripts were extracted, but the PDF structure itself is indicative of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=john+deere+gt262+owners+manual+download PDF link annotation
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/wowoxixotinigefif.pdfIn PDF document text
    • http://begdas.space/pebafixazifefapiq5o6y.pdfIn PDF document text
    • http://getsalle.xyz/75131334534ko4nb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_603058079399a.pdfIn PDF document text
    • http://pixell.store/26904274697sj590.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/kotomupi_vaxoki_luluxibi.pdfIn PDF document text
    • https://jepololazatozuj.weebly.com/uploads/1/3/4/6/134601538/2626742.pdfIn PDF document text
    • http://mmeueue.space/81395696378lvm4j.pdfIn PDF document text
    • https://gugajapu.weebly.com/uploads/1/3/5/3/135330564/givozifop-dofesokad-bifodil.pdfIn PDF document text
    • http://my-favshopg.online/global_importance_of_medicinal_plantsqu3cb.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/zeneziretus.pdfIn PDF document text
    • http://todayshop.website/jubobedugmbq9q.pdfIn PDF document text
    • https://pexekakuxop.weebly.com/uploads/1/3/2/8/132814074/2112277.pdfIn PDF document text
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/nejagok.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/translate_b_inggris_indoefszc.pdfIn PDF document text
    • http://olymptrade.buzz/rs_aggarwal_maths_textbook_class_8_free_downloadsizbu.pdfIn PDF document text
    • http://kyponnik.online/sample_inventory_stock_status_report2r6lq.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/vokamabobuzejuvopev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 5440 bytes
SHA-256: 3496c083f5c6c46781f63beba743e368a6603cf43b96c3d57a6668a4cb6787c4
font_01_sfnt_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 10196 bytes
SHA-256: d57e91ef4d4fd77aa5f3bec340c4339da5c9d4d59205c0869a32fbce124a7d9f
font_02_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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