Malicious PDF — malware analysis report

Static analysis result for SHA-256 db88d7a9038e232c…

MALICIOUS

PDF

74.7 KB Created: 2021-05-02 07:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ebaf938e2d829bc65e65507c6551d48a SHA-1: 6347bbab24e2958106debd62113ec391f61f2e5e SHA-256: db88d7a9038e232cdca7612c9ee68d5b7043c1c4dab2c1f032629ae5325a1da8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The primary URL identified, https://jacksth.ru/strik?utm_term=el+libro+de+los+abrazos+rese%25C3%25B1a, is likely used for phishing or malware distribution.

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://jacksth.ru/strik?utm_term=el+libro+de+los+abrazos+rese%25C3%25B1a PDF link annotation
    • https://cdn.sqhk.co/gotubosif/GmQgiVv/espn_the_magazine_subscribers.pdfIn PDF document text
    • http://fukozokugolot.iblogger.org/april_2020_romance_books.pdfIn PDF document text
    • http://fuxisileza.mywebcommunity.org/can_t_you_see_tab.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/xijedorifakejip.pdfIn PDF document text
    • http://xobukafa.iblogger.org/sociology_anthony_giddens_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/DTeY6hh/amazon_kindle_fire_hd_10_warranty.pdfIn PDF document text
    • http://funomixukipiv.iblogger.org/zurumigisenawujazukuta.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/bujipasafovutitepagipikev.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/gciChci/22602785662.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gasikogo.rf.gd/63930363330.pdfIn PDF document text
    • http://lubejenaje.rf.gd/97473807123.pdfIn PDF document text
    • http://nupuwabubud.epizy.com/chemistry_a_molecular_approach_4th_edition_free.pdfIn PDF document text
    • http://pusovogubazix.epizy.com/trasplante_de_medula_osea_2020.pdfIn PDF document text
    • http://nizamazibenu.rf.gd/runaberezutugob.pdfIn PDF document text
    • http://suwetiwojiza.rf.gd/nipuxenav.pdfIn PDF document text
    • http://rujujarorimepa.rf.gd/hernia_hiatal_deslizante.pdfIn PDF document text
    • http://lipemilidibimu.rf.gd/dinipates.pdfIn PDF document text
    • http://pegudopujisofed.rf.gd/murixemo.pdfIn PDF document text
    • http://jijudewaroj.epizy.com/transition_words_worksheet_6th_grade.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_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 5180 bytes
SHA-256: f9764fbb021fde9571c4baab034b13c31f3ab3ed966324314bedd8bfb683dcf9
font_01_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 12380 bytes
SHA-256: 5c03e5eda804748dba6d7837dfb392fa224ef7c881f9d77877827260b40bbd76

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