Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e87a5e5d8829e7…

MALICIOUS

PDF

70.6 KB Created: 2021-05-08 17:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 520f43e29f210408e436ca47353f2b32 SHA-1: ba90d31ef221d750e81a56ec8c1037853be034a8 SHA-256: e8e87a5e5d8829e703e049ffa5a3954f35da58d5778da80eb130d8e0770c8726
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL leading to a domain associated with phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious phishing or malware delivery attempt.

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://jumiwimov.ru/strik?utm_term=la+siesta+del+martes+preguntas+y+respuestas+antologia+literaria
    • http://lexukugeru.22web.org/panexixusepun.pdf
    • http://lumasilove.iblogger.org/ultrasound_guided_shoulder_injection_procedure_note.pdf
    • https://cdn.sqhk.co/regisanozoxo/Wjfl7ac/purozixirutakimutuzak.pdf
    • https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/3235707.pdf
    • https://zavetogodafewer.weebly.com/uploads/1/3/4/7/134709275/4230538.pdf
    • https://doxekitonibi.weebly.com/uploads/1/3/5/3/135326555/3366764.pdf
    • https://cdn.sqhk.co/dagorabowixu/veijgjw/24441765196.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://mexefesu.epizy.com/acide_sulfurique_gratuit.pdf
    • http://nolutujurevovi.epizy.com/biochemistry_lehninger_download.pdf
    • https://s3.amazonaws.com/jezobasit/dometic_awning_motor_recall.pdf
    • https://uploads.strikinglycdn.com/files/372f4b95-6a6d-499d-916e-2bb9a1b33be2/harrisons_principles_of_internal_medicine_19th_edition_release_date.pdf
    • https://s3.amazonaws.com/nitajosasa/bakigad.pdf
    • https://uploads.strikinglycdn.com/files/0b5dbc91-5911-43fd-83cd-732f41960aa4/what_is_the_paddle_attachment_for_kitchenaid_mixer.pdf
    • https://uploads.strikinglycdn.com/files/f6b8f0ea-91af-4e5e-81e5-d52bdffe0a62/tokolebomatusuk.pdf
    • http://firuwasuwubo.epizy.com/98413489154.pdf
    • https://s3.amazonaws.com/gurafoga/aaron_crowder_conflicted_album.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/60277124736.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c91f.bin
b8ccded7c661004e94049025cf77b6f0d24019e9ae64411e42e427ce177c9c63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC91F 5204 bytes
font_01_sfnt_off0000dabc.bin
15aadfac1caa8a8aa8d41aa3b5bbcdf1e8239cfeea8c64c121d64ba652abb914		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 10612 bytes
font_02_sfnt_off0000fec8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 4324 bytes

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