Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13262fd77b7b7e9…

MALICIOUS

PDF

78.8 KB Created: 2021-03-28 18:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 61464e21a16718c849021dd4dd19a90d SHA-1: e18c166a49f39f4912dcb473a73cea6a385c9e56 SHA-256: e13262fd77b7b7e9c8a2ab64e67144b5edad8f658af57f919fe2aff4a3fa2c9f
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, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to potentially malicious content or phishing sites.

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://botokaw.ru/123?utm_term=bleacher+report+saints+vs+eagles PDF link annotation
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/b9fa6ac1.pdfIn PDF document text
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/0267a7bcf1.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/hjutieq/new_hearts_stickers_wastickerapps_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/ngfhgHQ/ditomegisogematederax.pdfIn PDF document text
    • https://janukavosoxavu.weebly.com/uploads/1/3/4/3/134318620/db849f562.pdfIn PDF document text
    • http://xoxapepagaxon.mypressonline.com/clases_de_sustantivos_ejemplos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485573/normal_5fff0a48a0c4e.pdfIn PDF document text
    • https://tafebitekule.weebly.com/uploads/1/3/0/7/130776603/2640713.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CKsihKb/40504930244.pdfIn PDF document text
    • https://tugesarafexo.weebly.com/uploads/1/3/5/3/135319839/fegad.pdfIn PDF document text
    • https://setuwome.weebly.com/uploads/1/3/0/8/130874340/lavatilofet.pdfIn PDF document text
    • https://kapumalozaz.weebly.com/uploads/1/3/4/8/134892255/1955947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381287/normal_5ff385fc69d0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_6030cc16c0a68.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/agejbez/79037135091.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb0a955-4a0d-4bea-9eeb-f3748d2ff5d1/elizabeth_bennet_rejecting_mr_darcy_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c30839-64f1-4397-a095-1521db065aee/danabimorixakif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5d41b9-ae9b-4c25-94ab-9c02eac8c117/2005_buick_allure_cx_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e878fb96-15b1-4f29-95da-eeedb989cf8b/69353649524.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/air_pollution_nptel.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_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 5304 bytes
SHA-256: fcde8abbcfef16510114f40cbfe85d86148ce514468978b74aa190dcd88258e0
font_01_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 10708 bytes
SHA-256: 699351f0314eb51341f349d84c6efaad36b8507c78f18bd76d4d0fdc1dcece16