Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5a6fb4d8b300a2…

MALICIOUS

PDF

77.0 KB Created: 2021-04-16 14:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cc09037380ca6d19e3700511a40b7c5d SHA-1: d9ec004254c3ce4304b3b961aa657b6424a4e1ba SHA-256: 9b5a6fb4d8b300a2b99e41b4fbbaf047ca5e357269added471169bf56ec1d07f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/strik?utm_term=fresh+off+the+boat+cast+now PDF link annotation
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/jedajoj.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/2006_honda_odyssey_exl_tire_sizejlsdw.pdfIn PDF document text
    • http://buliwomof.22web.org/free_wedding_invitation_templates_word_2007.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/fjehdj0/78443447435.pdfIn PDF document text
    • http://smeh-mif.space/12_inch_kicker_comp_box_specsioayz.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/2185373.pdfIn PDF document text
    • http://goodsfor.life/77690682713u9tou.pdfIn PDF document text
    • https://cdn.sqhk.co/sukijubese/SE8XEf3/ted_talks_education.pdfIn PDF document text
    • http://freud.icu/download_gta_san_andreas_mod_apk_and_datao25yk.pdfIn PDF document text
    • http://btsworld.org/videos_de_monster_energy_autoskzuft.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/are_grocery_store_employees_getting_covidf6gok.pdfIn PDF document text
    • https://cdn.sqhk.co/kinubowa/hahiFha/14653448743.pdfIn PDF document text
    • http://theandyhong.com/nakebibituzuwapuvozuzisrsn9p.pdfIn PDF document text
    • http://twirlini.com/razes_do_brasil_o_homem_cordialmbg5s.pdfIn PDF document text
    • http://probkin34.xyz/kuzurize0rwpq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mopasaz.epizy.com/linen_house_sheets_sale.pdfIn PDF document text
    • http://xepuxamilija.rf.gd/apgvb_app_free.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_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 5124 bytes
SHA-256: 30e3b070c85fc687f11d168f6a3e7b45bd5f919f64ae0b62ebb2ab3c8ebe6578
font_01_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 10780 bytes
SHA-256: a3d213264c9bbc68bc3313c6fdf552f9008bd1f153f370615abb0d8681127304