Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85c8fcf5af91ab6…

MALICIOUS

PDF

79.3 KB Created: 2021-03-24 20:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9fd874fbc72065908a38ee1db63f2e2a SHA-1: b17be4c20de924ff686261a2d9d39b1b8bbd0205 SHA-256: a85c8fcf5af91ab6dcc83d7a4fee004cc279eecab6a20425e167876ab3949dc4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=bbc+news+articles+pdf PDF link annotation
    • http://teachost.com/ielts_academic_writing_test_sample_answersudnv0.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/gjgGfwT/mindspring_email_server_settings.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/heidjbr/quesos_fundidos_tipos.pdfIn PDF document text
    • http://popapirim.22web.org/10934317039.pdfIn PDF document text
    • http://bopikifej.22web.org/moravatigilemejutu.pdfIn PDF document text
    • http://lojuxaga.mywebcommunity.org/dorero.pdfIn PDF document text
    • http://jidapuxedepu.medianewsonline.com/is_ice_breaker_gum_sugar_free.pdfIn PDF document text
    • http://menedowu.iblogger.org/samsung_smart_tv_powered_by_android.pdfIn PDF document text
    • https://cdn.sqhk.co/kelufuro/ziihhBK/zombie_222_mustang_burnout.pdfIn PDF document text
    • http://vzroslyh.net/how_to_cite_the_declaration_of_independence_purdue_owl66dfq.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/gZgfwij/55323899743.pdfIn PDF document text
    • http://meetsalon.xyz/how_to_reset_kenmore_elite_smartwash_quiet_pak_9vskau.pdfIn PDF document text
    • http://100naturals.fun/tibififokolijivewakfs04m.pdfIn PDF document text
    • http://busivel.xyz/annual_salary_compliance_specialistxv2jv.pdfIn PDF document text
    • http://playmarket-online.com/no_game_no_life_light_novel_wikipediaa7qyi.pdfIn PDF document text
    • http://pogadai.xyz/how_much_money_does_gold_and_silver_pawn_shop_makexn9wq.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/jurnal_karakteristik_ajaran_islam.pdfIn PDF document text
    • https://cdn.sqhk.co/lodoseduler/YtjYjhX/modogiwenarujutisijax.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://vulekagezefodek.rf.gd/zipibapit.pdfIn PDF document text
    • http://xukitekebuza.epizy.com/the_ruby_circle_ending.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_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 5108 bytes
SHA-256: e11ac436b7c71aa42ea397c8d71b8c695434c274b4cd83ef374375d82d2b917f
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 10864 bytes
SHA-256: 445f9b28b1d83403946c691e83719d4deeb7ccf89875ffceba755db6554de95c
font_02_sfnt_off000121dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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