Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdb9f252084f2bf…

MALICIOUS

PDF

107.6 KB Created: 2021-03-07 15:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a98798e87a4e0eba8d33ef70710aadb SHA-1: baf6e9ee360baa1f7f2c1bcb47b0b48d86b725cb SHA-256: cfdb9f252084f2bf5e1ca5f0722c703fc676a0dee8fb62a8eb2eff28716fcf1b
186 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 of which point to disposable hosting and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's used to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/aws?utm_term=atonement+ian+mcewan+critical+analysis PDF link annotation
    • https://zudupati.weebly.com/uploads/1/3/1/8/131856533/suxogofij-tufowaliv-novafewudibeku.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/what_is_the_flat_rate_for_international_shipping.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/2604500.pdfIn PDF document text
    • https://tovexalo.weebly.com/uploads/1/3/5/3/135348509/deruzegudivev.pdfIn PDF document text
    • https://guwusupokase.weebly.com/uploads/1/3/1/4/131437041/8068433.pdfIn PDF document text
    • https://dovewonarada.weebly.com/uploads/1/3/4/6/134672256/b3776.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/a8161d65.pdfIn PDF document text
    • https://mijipunipiju.weebly.com/uploads/1/3/1/4/131455283/6493770.pdfIn PDF document text
    • https://wotowabe.weebly.com/uploads/1/3/4/6/134688823/xuwibiwufanodaxiwusa.pdfIn PDF document text
    • https://mavekajokirusap.weebly.com/uploads/1/3/1/4/131437454/9798648.pdfIn PDF document text
    • https://xutewosabog.weebly.com/uploads/1/3/2/3/132303209/470057.pdfIn PDF document text
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/f457ee.pdfIn PDF document text
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/e457ba6.pdfIn PDF document text
    • https://ritosigom.weebly.com/uploads/1/3/1/4/131453630/lowukuzorak.pdfIn PDF document text
    • https://xupugafowepeg.weebly.com/uploads/1/3/0/8/130814457/bunagogu_kinitujaferi_xajipedevirup.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/tabla_de_conversion_fracciones_de_pulgadas_a_milimetros.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_9ca73d4426bf4eb88f22a72410669036.pdf?index=trueIn PDF document text
    • https://4694dce0-4d1e-4c77-b4da-d1f025f82355.filesusr.com/ugd/fb332b_d84b347040214e50853794a5691e0175.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/459cf8f1-fcf5-48f1-bd4e-2a0dc87b215f/ejemplos_de_diagramas_de_flujo_para_programacion.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_67672f3c4ca04b089e4bdba6b066957a.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_229ca179ed6341a8abd13405bd3990fb.pdf?index=trueIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_0fde176bbe3446978535f0a501eb268a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61fda2a-3208-45f9-a534-102ac71feac0/focusrite_scarlett_6i6_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c306e5c4-a052-4219-bb0c-ac9d3ae25061/what_are_material_incentives.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_off00016a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A34 5128 bytes
SHA-256: 453ddf6882e144d98563109bc0b915d49228ee9d2203b319962b70d198cfcaa2
font_01_sfnt_off00017ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BA0 11152 bytes
SHA-256: 5fddeacf5a9aad5a18d4cc02a036148d2562e31ca0f21a4bd202ac71e90fa88f

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