Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09d10a7ee56978f…

MALICIOUS

PDF

80.9 KB Created: 2021-02-25 05:36:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 550d9734dae7171d68508e5f3574193a SHA-1: 56578098d22ccb62d4585975f3fdf452a261c090 SHA-256: e09d10a7ee56978ffbbc4db1ddd42877b0132d2a2de4b10c3fb3a9a9e6b77705
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs disguised as setup information, with the primary URL being https://leonvi.ru/strik?utm_term=netgear+wndr3700+extender+setup. Heuristics indicate this is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://leonvi.ru/strik?utm_term=netgear+wndr3700+extender+setup PDF link annotation
    • http://tufuwavaziga.mygamesonline.org/lepijozosi.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/ehcheib/dead_trigger_3_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/gfMVUhZ/zokukejiterovexibowid.pdfIn PDF document text
    • http://rarebuzoxexovom.22web.org/25615923441.pdfIn PDF document text
    • https://cdn.sqhk.co/naxusepimosa/hhgjght/star_wars_kotor_3_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoveted/qtJQjaJ/star_wars_timeline_years.pdfIn PDF document text
    • http://tazibadubikatim.iblogger.org/dikujozekaruvilakazilep.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/gegfUWW/nujulapegugiv.pdfIn PDF document text
    • http://bet-info.ru/rikuthg2uz.pdfIn PDF document text
    • https://cdn.sqhk.co/nazujovo/hihgUie/wijaxu.pdfIn PDF document text
    • http://puwonasomoso.22web.org/58884676543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/vezaxidazana.pdfIn PDF document text
    • http://desutowifikabek.rf.gd/android_id_changer_root_apk_free.pdfIn PDF document text
    • http://livirava.atwebpages.com/bemubinizipurebo.pdfIn PDF document text
    • http://tivewigaviris.rf.gd/brown_skin_girl_wizkid_beyonce_song.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_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 5608 bytes
SHA-256: d1a25fd695d827a9e5bd160eda62dc23e913020e9e6969c9e3050d211c091fa0
font_01_sfnt_off00011236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11236 10820 bytes
SHA-256: acef11d1f2d4a3396828ed24f679db95ff2ebcc8952c0e4c6d26bc665869157f

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