Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e497e98b20b4970…

MALICIOUS

PDF

80.2 KB Created: 2021-03-05 01:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dffcd9851a67aae2311d9c1622d4e5af SHA-1: fa95da0efc57fdf1eaf010666801993367a08703 SHA-256: 2e497e98b20b49708fa1d029a8ea4dac3415171c550339f6fd3d777d63bcccb4
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL https://xajibur.ru/strik?utm_term=... suggests a lure to a site that may host a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=what+three+things+do+plants+need+for+photosynthesis+and+how+does+a+vascular+plant+get+these+things PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410448/normal_5fcc5567d0d18.pdfIn PDF document text
    • http://top-shop-store.website/win_7_ultimate_salam_indirjr0hl.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/he6jjib/bovizupimalaliwebise.pdfIn PDF document text
    • https://bekodezu.weebly.com/uploads/1/3/1/8/131856725/xoxofuboxukigelovina.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/LbFgc74/burit.pdfIn PDF document text
    • http://tur8osale.site/air_on_a_g_string_pianofgtc7.pdfIn PDF document text
    • http://powuvomewekuxeb.getenjoyment.net/the_reluctant_fundamentalist_summary_chapter_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_6034bf2e74e04.pdfIn PDF document text
    • http://reduslim-official.website/gilamizuwage3ko2l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_600e96315fe36.pdfIn PDF document text
    • http://carishr.com/33682059025ej960.pdfIn PDF document text
    • https://voximarabot.weebly.com/uploads/1/3/1/3/131383255/kidoval-kejameguwarit-limapewutusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457854/normal_5fd2d4c67b533.pdfIn PDF document text
    • https://cdn.sqhk.co/wewutivuv/gdepU6e/chocolate_reaper_pepper_seeds.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/5_month_milestones_listbna42.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/415a44a5-7272-4b59-9c73-c023174750e3/voice_search_asus_chromebook.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/piwafukex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb18479-a70d-474c-8504-061d0804bf87/honda_ruckus_reviews.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_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 5684 bytes
SHA-256: 1df8c885e3b57de5307e596d576d8c971cf9532a62da2b72d467d05a154fc3cd
font_01_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 10952 bytes
SHA-256: 5442ea3dd8e17a1de55104ae7972aa8bf0c2954b6021205bcecb4aec0044ed13

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