Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea138c2e57965f1…

MALICIOUS

PDF

76.7 KB Created: 2021-03-03 18:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 515dcfac3c01b1597c52b4cca963e94d SHA-1: fd0c44b2d557613193c0bae71580f5234b5fd321 SHA-256: 8ea138c2e57965f1da8f8d15d779a4060a2605cce9ea3c88f9a4c7839a45e4d8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it's a link farm and uses invisible links to direct users to suspicious domains, such as http://loginwithfb.site/. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://druttle.ru/award?keyword=the+magic+of+belle+isle+similar+movies PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367294/normal_5fdd83188fb90.pdfIn PDF document text
    • https://sefujokugitexas.weebly.com/uploads/1/3/1/4/131408298/zizuxivudogove_geduru_vugimarukefemot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414164/normal_601ca280cbb7a.pdfIn PDF document text
    • http://okstore.info/how_to_remove_acne_spots_fast2k42f.pdfIn PDF document text
    • http://paktum.pro/d-link_dcs-930_lbugmv0.pdfIn PDF document text
    • https://luwujejajevobo.weebly.com/uploads/1/3/1/4/131407494/1f19e044.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/rifhbxf/4737604409.pdfIn PDF document text
    • http://loginwithfb.site/brown_rice_vs_white_rice_nutritional_informationsoyo9.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/jitahaX/budepelapezuvipib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_602e0128a3624.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/jgW3ogr/idle_zombie_defense_prestige.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/ibKggik/91992466376.pdfIn PDF document text
    • http://vsspb.ru/98417526007zhomv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443325/normal_600913bb747e9.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/3uqifgf/checklist_manifesto_chapter_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fda69c4f25a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465905/normal_5ffb806b01301.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5ff42eca30d63.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/short_life_3_gamedn8nk.pdfIn PDF document text
    • http://center-about.com/21649107178y7s8n.pdfIn PDF document text
    • https://nakenofol.weebly.com/uploads/1/3/0/8/130814118/keronopoxazinobip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5fc71accb0486.pdfIn PDF document text
    • http://lastmarkt.ru/91722154029e8d4x.pdfIn PDF document text
    • http://asia.kiwi/scroll_template_word_freeux8wx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 5444 bytes
SHA-256: 187c2e7d1a4dbf1e165cda2478ce8f270fc71cd2db2863ad535f66cdb9b67465
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 10888 bytes
SHA-256: 6b3de440425db78f47998fbe32164c549b33ef89065f35648ccbd37bdc78c647