Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0ea7ec6c758d03…

MALICIOUS

PDF

79.3 KB Created: 2021-02-28 12:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 39a4c7260c10b40b8a2076599826eff5 SHA-1: 5c745e0f61c74c240fcaf003dff3bdf867fa378e SHA-256: be0ea7ec6c758d03cdccdea8ee0699dd5ef2edd37dac56d72baa1c1a374869c9
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one pointing to 'zajinet.ru', suggesting it's designed to redirect users to a potentially harmful site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=how+to+use+a+omron PDF link annotation
    • https://cdn.sqhk.co/lazujanaziri/HKhgBhe/barinujoridizula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_60366dc6c1757.pdfIn PDF document text
    • http://lemujivowukita.22web.org/kuvisejumaxeme.pdfIn PDF document text
    • http://topshops.website/52875568886tf8it.pdfIn PDF document text
    • https://cdn.sqhk.co/judixixelof/6wZNyp2/barrett_jackson_scottsdale_2019_tv_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/bokupajokim/7GUgcPr/50383731417.pdfIn PDF document text
    • http://brumbum2.xyz/vugibaxajenamotewnnna1.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/viiggjd/susatezugimikijuxidezozoz.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/ijAiajj/school_of_dragons_membership_free_trial.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
    • https://s3.amazonaws.com/senodiw/list_of_places_to_change_your_name_after_marriage.pdfIn PDF document text
    • http://gefotuja.rf.gd/lds_hymn_come_thou_fount_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/baby_rubber_sheet_for_double_bed.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/xewudebuxiwe.pdfIn PDF document text
    • http://pilisabewagedix.epizy.com/how_to_get_good_at_drawing_anime.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_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 4684 bytes
SHA-256: 869bf5c56efd435f81ab5a1ce4744f68b985dbf5e41a902d4ae7e77b27fd2687
font_01_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 10116 bytes
SHA-256: 2e22d9ecef94910dfd63ae1574476e6d23b23030fc273352126a3ecc4750ba2f
font_02_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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