Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e94eea992ee890…

MALICIOUS

PDF

81.8 KB Created: 2021-04-21 02:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b8943e9b857331d48d8004a468e2e523 SHA-1: 7abcb19d3949ec9c03f0cdfe6ac6bef6e81793de SHA-256: e6e94eea992ee89077b23c7ff8474915d86fb2e990294c4bfa969dbe9b9bca8a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains text related to 'developmental delay', suggesting a social engineering lure to encourage users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=is+developmental+delay+curable PDF link annotation
    • http://beautytopshop.site/supixulikabaxamozodej0pn7l.pdfIn PDF document text
    • http://gagelepapu.22web.org/baby_girl_song_english.pdfIn PDF document text
    • http://noksipals.online/symbolic_logic_irving_copisxprg.pdfIn PDF document text
    • http://thelait.pro/621106459924v5bq.pdfIn PDF document text
    • http://ersoil.fun/treatment_of_postpartum_psychosis_nice_guidelinesryujg.pdfIn PDF document text
    • http://fixmarker.fun/wozapofz8s6p.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/xurixado/85146929433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c102539d-baaf-48ce-a2e3-8fcffee93e3e/33401548640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c8afa9f-59d4-4ede-973f-af5ff5cf5e47/86842171645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816fa8fb-a01d-4804-ad84-238f43b0237b/11311038404.pdfIn PDF document text
    • http://tunukolan.epizy.com/38783628644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9c94b5-c0fb-459b-bd37-2ccf38069872/trigonometry_formulas_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8309ca4-3dc1-4088-9df0-4912553aca0f/phonics_worksheets_for_pre_k.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/45810865675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea01c75-6dbd-42b9-931a-4ed2434234c9/eset_smart_security_premium_12_license_key_2020_free.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/the_lone_ranger_tv_series_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/annapurna_trek_self_guided.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb115f0a-9871-458a-8e4a-16ca8724f998/surelisizuvudek.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/4000649135.pdfIn PDF document text
    • http://xitutudatiri.epizy.com/94393856042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bcc9bd2-ec8b-415d-86c4-c640e6bcdd67/89170551767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc19f75-7509-41b9-a916-10a5faadfb8c/specific_heat_lab_worksheet_answers.pdfIn PDF document text
    • http://dagubafevipiken.epizy.com/jesasezowoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12188163-009a-42c9-8614-61c4592a1305/what_are_the_maxims_of_equity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0149058-44c3-4956-a66b-a6fef29116d4/jupapitag.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_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 5292 bytes
SHA-256: d1d9751c37d7fe08bdb380ea051f80f214e436ee7e7773f262befd94fb97afb3
font_01_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 10832 bytes
SHA-256: fa0915c87a9d701fc09e26b78f57a70d37dc692ab93eb0b130c264911c14f80d
font_02_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71