Malicious PDF — malware analysis report

Static analysis result for SHA-256 4273630b371b802d…

MALICIOUS

PDF

71.2 KB Created: 2021-04-09 14:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a88322086c912d48ed8958abe6ebf97e SHA-1: d0211851948bfda58462424a7afa7a05a5b17d7a SHA-256: 4273630b371b802d44ef3d5f992e7346e8ad6969a8f4eaa09d6bb186f9c2af8e
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=navy+technology+acceleration PDF link annotation
    • https://cdn.sqhk.co/bajowekununa/ifahiex/21441743183.pdfIn PDF document text
    • http://strita.space/arduino_mega_esp8266_connection3k6kl.pdfIn PDF document text
    • http://ropisunofo.mygamesonline.org/convert_to_word_adobe_x.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/90197929683.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/hdgilds/hachiman_quotes_in_japanese.pdfIn PDF document text
    • http://hermidkovo.info/which_python_course_is_best_in_coursera4rklz.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/vhcjjAx/94167453917.pdfIn PDF document text
    • http://pobasomitiji.22web.org/tevokupufepuneg.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/Fgdhgrz/horse_run_fun_race_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/gT2hbih/lebusibekozejewik.pdfIn PDF document text
    • https://cdn.sqhk.co/muwitajo/jNiiIjd/13415448176.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/bTCihrf/welcome_to_the_future_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/L7UjaZp/15685158459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanaxaj.rf.gd/25005113799.pdfIn PDF document text
    • http://fagemefixuf.rf.gd/18367374902.pdfIn PDF document text
    • http://xalovizavana.rf.gd/rukuseboxumul.pdfIn PDF document text
    • http://zavulelobawabi.onlinewebshop.net/40637164562.pdfIn PDF document text
    • http://zewivijususilub.epizy.com/ashrae_handbook_1997_fundamentals.pdfIn PDF document text
    • http://vawamunasujefu.rf.gd/4650463669.pdfIn PDF document text
    • http://nubijusumodas.rf.gd/muslim_calendar_2020.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/effective_c_book.pdfIn PDF document text
    • http://vajipiposugeto.rf.gd/dosip.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_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 5016 bytes
SHA-256: de5927942bf209fd86cbcded1e9e2f846d0a697f95e49908ea6564ba473ee8d8
font_01_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 10440 bytes
SHA-256: ac931a5426a5ae93de00ab6f34044f22a3b9b4cf56f629cfa31efe31603d54fe

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