Malicious PDF — malware analysis report

Static analysis result for SHA-256 805bed08ea2cb7cf…

MALICIOUS

PDF

85.3 KB Created: 2021-04-02 01:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8c7bd09cd89bfc035f4be186fe421533 SHA-1: 9e902cdecdea31f36b904593e21a838c43df8f56 SHA-256: 805bed08ea2cb7cf0d7477d2edc34640dc29cf172ee308fdff04ec9473e1cabb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=what+is+day+trading+and+swing+trading PDF link annotation
    • https://nimivumunekal.weebly.com/uploads/1/3/3/9/133999229/vanapa-lelovebunitavem-kajatovuxotabu.pdfIn PDF document text
    • http://4338bacchus.com/ratujukekor5579.pdfIn PDF document text
    • http://itanto.space/samsung_nu7100_65_user_manualjizt4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460981/normal_60567277404c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_5ff9039b495c9.pdfIn PDF document text
    • https://fuwelobuzade.weebly.com/uploads/1/3/4/6/134649994/banosuvana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448113/normal_6001373b8a489.pdfIn PDF document text
    • http://italiahot.fun/39_bcs_result_2020hpz9k.pdfIn PDF document text
    • https://dujililapute.weebly.com/uploads/1/3/5/3/135347223/415afd9d7d.pdfIn PDF document text
    • http://copyrightsupport-ig.com/rurisipuzexivwh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475219/normal_6002952b2c980.pdfIn PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/7391756.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_8224f11531b245448a388ce391f1726c.pdf?index=trueIn PDF document text
    • https://9301df3d-c689-496c-811c-0581e5fecd74.filesusr.com/ugd/f62067_30db24c2c66147378ba54d00a19f60eb.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_d950d4fabf0d4a9c862e7d1e320a7db8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xixonu/ring_doorbell_reviews_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/nothing_bundt_cakes_confetti_bundtlet_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/vajuwokunibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a51724-88c4-4507-9efb-8c84441e575b/49470164119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ddf1ec2-ec45-45e8-bbc4-282f3cad034b/26211841112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1506218-98ed-4a2d-b8b9-ee19a303749c/le_petit_prince_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883451d5-1320-4b7e-bfea-5e04fa3c07da/55826697895.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 3008 bytes
SHA-256: a0eb5f260e662aab5ca3a6fb4cea331b1ab214299242d7ec21eae0fa4ddc83c1
font_01_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 5264 bytes
SHA-256: 2013df3f8f5689f19e847312eff81a66461d7734dadd7776aa54a7f285213ced
font_02_sfnt_off0001204a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 11424 bytes
SHA-256: e87958e658c2177d4dd8c25d9e173804ba1a541c41900d70c88b7e88d302e89f