Malicious PDF — malware analysis report

Static analysis result for SHA-256 736a6db4655cd2c2…

MALICIOUS

PDF

82.5 KB Created: 2021-03-21 11:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4bb5c73e6cabeb5521a356bc0c67b71f SHA-1: 23aef1dfa0c4a1a48e3de191dcd7d6c4662c8428 SHA-256: 736a6db4655cd2c21a7f59e95e5ea1cfcedecda15d1184a7e103ffedab4936e8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=malaysia+holiday+calendar+2020+pdf PDF link annotation
    • http://eyebrowthreadingdallastx.com/samsung_un24h4500_smart_tv605iw.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/jgKiehg/beethoven_virus_tap_1.pdfIn PDF document text
    • https://papadapogapov.weebly.com/uploads/1/3/4/7/134706375/movivimuvir.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/grEji8f/37319662374.pdfIn PDF document text
    • https://puzepoxa.weebly.com/uploads/1/3/4/3/134318678/789d449717.pdfIn PDF document text
    • https://xelusivixofon.weebly.com/uploads/1/3/5/9/135958974/jasisoxovepege.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/jiMVhjN/your_dad_simulator_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/mxheja5/52651150149.pdfIn PDF document text
    • https://cdn.sqhk.co/kafosine/hhxicjb/examination_day_by_henry_slesar_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jojewezalika/3gfoZMg/waxojewarusefego.pdfIn PDF document text
    • https://cdn.sqhk.co/tifomogoketu/uLhcHOt/candy_frenzy_2_level_47.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/ji5Fgf5/kixufesenun.pdfIn PDF document text
    • https://cdn.sqhk.co/vawikepaf/ggmibgc/59401530063.pdfIn PDF document text
    • http://everydayy.fun/oxford_3000_english_words_with_meaningdld5h.pdfIn PDF document text
    • https://cdn.sqhk.co/xemuxebu/jGi7B9X/knife_sharpener_reviews_australia.pdfIn PDF document text
    • https://zonanasuwovu.weebly.com/uploads/1/3/2/6/132683154/1029399.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/Qhef0je/38208478295.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dasupepu.epizy.com/the_secrets_of_practical_kabbalah.pdfIn PDF document text
    • http://zarazemudaseri.epizy.com/19553885153.pdfIn PDF document text
    • http://mitekavutoz.rf.gd/calendario_octubre_2020_imprimir.pdfIn PDF document text
    • http://fatowulur.epizy.com/business_plan_south_africa.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_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 5624 bytes
SHA-256: b89d55845cbb4bdafc13ce72fce96291d98e2996f10d7a05bafea8ce3f76b8f2
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 2292 bytes
SHA-256: e26eac9065c9a76012017d219ce8b42f0c29ef93da3aa8ee3091f7f7e10bb9f4
font_02_sfnt_off0001131b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131B 11484 bytes
SHA-256: ecc895c1a071588340e4ee0fccea76a6355afa16250559f16ecd442ebb6b6f87

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