Malicious PDF — malware analysis report

Static analysis result for SHA-256 8278faef51aa14bf…

MALICIOUS

PDF

81.9 KB Created: 2021-04-02 00:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d46853a84120d04c29e54ba383c0ef2 SHA-1: 5fbbfa3b2bad24b67cd3b70b3b9f580f818affc2 SHA-256: 8278faef51aa14bf673d4f1c0a4b7922e61deeaaed91a7d57923495370b946df
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://baarspo.ru/award?keyword=ctet+question+paper+july+2020+pdf+download PDF link annotation
    • http://leon-stavki.info/garmin_g600_maintenance_manualu68rn.pdfIn PDF document text
    • http://rerokofige.iblogger.org/bwv_1043_largo.pdfIn PDF document text
    • http://allerop.xyz/miss_fortune_guide_aramc0cjp.pdfIn PDF document text
    • http://bigonetudukori.iblogger.org/teledinulejuwosuxodetak.pdfIn PDF document text
    • http://endi-itali.space/journeys_out_of_the_body_hemi_sync_download0dwcy.pdfIn PDF document text
    • http://helen-art.ru/31940198525kn34u.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/free_geometry_worksheets_3rd_gradeejfpa.pdfIn PDF document text
    • http://tameenegypt.com/apple_ios_13_beta_profile61xlr.pdfIn PDF document text
    • http://betabudon.iblogger.org/zubuvukukon.pdfIn PDF document text
    • http://losmopaka.site/emulator_android_untuk_pc_paling_ringangf7xm.pdfIn PDF document text
    • http://francobusiness.com/88685141947ww0ea.pdfIn PDF document text
    • http://pumba-timon.space/all_full_form_of_computer_in_englishjqnpc.pdfIn PDF document text
    • http://it50life.pro/yenggugiren_nee_en_pakkam_illaye_sonelrkd.pdfIn PDF document text
    • http://top-agent.ru/58156519176hkpn6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxupabazifo.rf.gd/crioterapia_articulo.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_c4a3881099bc46ba9d121661a2ce94de.pdf?index=trueIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_dba0b5171c334240aa29257f85c8640d.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_0e8c9b58b040405389ec355641a87c80.pdf?index=trueIn PDF document text
    • http://guwopide.rf.gd/78113348077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42acbc95-35fb-4728-9f34-04b0a042461a/how_to_fix_clogged_coffee_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9cf8b9-b7fb-4214-8b85-b642623f567e/navy_eval_ep_points.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_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 5612 bytes
SHA-256: 469f2efc926d7fd6d89bf3b22e2c836a7294e7c8ea6b6b000cc9d851c130248b
font_01_sfnt_off00011522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 11220 bytes
SHA-256: 3f0de7b6bd70248ad7b30b79da861b31bd59b9c1115dde17576113bc55a990d0

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