Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c81e30e8aa745a3…

MALICIOUS

PDF

72.8 KB Created: 2021-03-03 00:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a1c805ec8495ffe1991c156359ef56f0 SHA-1: ba681c5c4ed3fbfaa937f26885fca9261413b11d SHA-256: 5c81e30e8aa745a326e9c7901b7a17e7754425e7f72c882d511c40709cd01e51
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a keyword search for 'cyberghost premium apk uptodown', suggesting a lure for potentially malicious software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple external URIs and link farm characteristics further support a malicious campaign.

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://jacksth.ru/wix?keyword=cyberghost+premium+apk+uptodown PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466679/normal_60280376db371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_601f1d66f3b8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_600c9af7177b8.pdfIn PDF document text
    • http://navalny.design/vufukenedesimatopaganeklp6p.pdfIn PDF document text
    • http://rezonansmusic.com/black_desert_online_guide_dark_knight58k5r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409610/normal_6004e45f7080f.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/fabubefuvalelupenu.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/lawuka.pdfIn PDF document text
    • http://intekzafast.online/animal_crossing_pocket_camp_mod_apk_2019f31pj.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/ryobi_15_amp_10-inch_sliding_compound_mitre_saw.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/electricity_and_magnetism_study_guide_quizlet.pdfIn PDF document text
    • http://vorgazme.com/46745246320ayrvv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipanokule.onlinewebshop.net/how_to_clean_master_chef_ice_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/88600334139.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/nirebemosogoxuxomozav.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/explain_the_accounts_payable_cycle_answer.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/wonder_r.j._palacio_english.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/google_dictionary_for_windows_7.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_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 5644 bytes
SHA-256: 93e9afef1c836b682146ded90ed648ba9897eb1107f7f8b99128c90f9ab23c13
font_01_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 10320 bytes
SHA-256: 5165d685ccc33e17bb574065ad268362825f79fea61c69679bf1b96c44a12d08

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