Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84b3efd5e9c6571…

MALICIOUS

PDF

76.3 KB Created: 2021-03-05 09:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ae9987a0b652c296053cb539ef4d4bbd SHA-1: 536292f342f09ace811aa3c6ca13a7f9ece5967a SHA-256: d84b3efd5e9c65717259f6bcda7492e069352491a4435334a3a9f03bad593375
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a website disguised as a search result. This URL, 'https://vilenefex.ru/aws?utm_term=guitar+chords+for+hindi+songs+in+sa+re+ga+ma', is likely used to host a phishing page or download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/aws?utm_term=guitar+chords+for+hindi+songs+in+sa+re+ga+ma PDF link annotation
    • http://javatow.22web.org/basic_geometry_vocabulary_worksheet.pdfIn PDF document text
    • http://diletemofuvufu.22web.org/24674786827.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/88848118354.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/nenolazubowafuxagowabev.pdfIn PDF document text
    • http://jiludedo.iblogger.org/free_food_banks_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/dimewibakudi.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_e3cf527d3ab546bcb0fdd550d7393d03.pdf?index=trueIn PDF document text
    • http://fixedarutagovun.rf.gd/deep_learning_python_courses.pdfIn PDF document text
    • http://gonuwufif.epizy.com/anbe_peranbu_song_female_voice_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/farojerug.pdfIn PDF document text
    • http://vidobif.epizy.com/97204290179.pdfIn PDF document text
    • http://retuguru.epizy.com/how_to_do_business_taxes_on_turbotax.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/english_connected_speech_rules.pdfIn PDF document text
    • http://tajafenabuwibas.rf.gd/can_you_breed_daphnia.pdfIn PDF document text
    • http://towuvoti.epizy.com/ebay_mobile_app_apk.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_35a7c70cfdb74a929c1573ff7620599e.pdf?index=trueIn PDF document text
    • http://tewaremiluzavag.rf.gd/wolf_oven_prices.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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 5432 bytes
SHA-256: b21102689716a10c189f26e6b637007c93e933b0be56e47c59f94cff37699898
font_01_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 10776 bytes
SHA-256: 60c6b40b1338823bc9a8cf29974673723ad84943b4cb3545d7a61f0f92f88fdc
font_02_sfnt_off00011315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 3880 bytes
SHA-256: 04a0ceb9fdf134b93ac39743d75036e082a3cc53ec7fc3c26a87bb074c2280b3