Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d9a69708991848…

MALICIOUS

PDF

78.5 KB Created: 2021-02-26 21:04:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cdc98cd31a28197e0b62957914cf0999 SHA-1: ac486f72311b04730754baa9b2e9beca842846d2 SHA-256: 18d9a697089918488a5c5e9a4fe5c943a5fea3973c930812c6f76d7e0489afcd
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to health queries, suggesting a lure to disguise the malicious links.

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://maypoin.ru/strik?utm_term=how+to+relieve+stomach+bloating+quickly PDF link annotation
    • http://kopuvimu.scienceontheweb.net/mizekeninakorejaxolud.pdfIn PDF document text
    • http://paselon.getenjoyment.net/elitebook_6930p_battery_price.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/vox_ac15c1_tube_amp.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/53695516863.pdfIn PDF document text
    • http://damita.fun/carnival_hide_and_seek_fortnite_creative_codeknc9l.pdfIn PDF document text
    • https://xorewodanuvidiw.weebly.com/uploads/1/3/1/3/131381095/gawuv.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/2hEjhgj/risesasotimupevu.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/representation_and_the_media_featuring_stuart_hall.pdfIn PDF document text
    • https://dupudebokuvufex.weebly.com/uploads/1/3/2/3/132303235/38ef4a45589ebc.pdfIn PDF document text
    • http://sq11mini.com/wifugeaplug.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/skaven_battletome_free_download.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/imagenes_de_caras_emociones.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/eZgjbic/sling_blue_sports_extra_nfl_redzone.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/gwjgiiM/local_woodworking_shops_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litorow.myartsonline.com/troubleshooting_kenmore_600_series_washer.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/asus_m4a785td-m_evo_drivers.pdfIn PDF document text
    • http://girofili.myartsonline.com/pemajokexigomapumipadaruk.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_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 5760 bytes
SHA-256: 4c5ca2990ad680b3bcf351b5d73afce01455638d7b7cbbaf8387870854e2d00e
font_01_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 10272 bytes
SHA-256: edbd22195f54f29eb808100c6d3a22b8d3006cfca9c035ff9b1ecccdec2edba2

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