Malicious PDF — malware analysis report

Static analysis result for SHA-256 3187a154118e5c37…

MALICIOUS

PDF

69.5 KB Created: 2021-04-06 04:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ed9d78c18ee91444a64f27d0ebec3f2c SHA-1: 205197a5136808bea4a045f738ab4bcec0f5709e SHA-256: 3187a154118e5c37f53110641a769560aaff3ca3c307268a3a5382c018c77ea6
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 external URIs and is identified as a link farm hosted on disposable domains, indicating an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=far+side+christmas+cards+uk PDF link annotation
    • http://rijunoje.mygamesonline.org/afcat_2_2020_syllabus.pdfIn PDF document text
    • http://losopefopamusoz.sportsontheweb.net/gre_barron_12th_edition_vocabulary.pdfIn PDF document text
    • https://fazokovonopa.weebly.com/uploads/1/3/5/3/135329702/145680.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/kandungan_gizi_belimbing_wuluh.pdfIn PDF document text
    • https://dodemitewiv.weebly.com/uploads/1/3/1/3/131380707/wuzuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485305/normal_60154444c0107.pdfIn PDF document text
    • http://laketofetujeso.medianewsonline.com/alemao_basico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_604f6cb539ac7.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/32252117153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_603a57edb09f6.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/business_law_noun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445557/normal_5ff994638937d.pdfIn PDF document text
    • https://lurufakezudaka.weebly.com/uploads/1/3/4/8/134884294/zubifavaxovugo.pdfIn PDF document text
    • http://mojofaza.mypressonline.com/zikuzegapixezej.pdfIn PDF document text
    • http://datidino.iblogger.org/abbyy_lingvo_android.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/adele_turning_tables_sheet_music_piano.pdfIn PDF document text
    • https://sikapekit.weebly.com/uploads/1/3/5/3/135317012/rawukef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rijesoso.rf.gd/79322017521.pdfIn PDF document text
    • http://nifusotajezunur.atwebpages.com/o_alienista_resumo.pdfIn PDF document text
    • http://zepuwiz.atwebpages.com/yamaha_rx-v475_network_update.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/ccna_200_125_ebook_download.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_off0000c62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62E 4832 bytes
SHA-256: 81e0aeb2dac279c3102d3f4d1eac454f055919f3614725ef933af676c49302f8
font_01_sfnt_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 10044 bytes
SHA-256: 885391696d7607341184d68089e4bdff01f6350ab7d069b5ddea0c41155d1eeb
font_02_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2