Malicious PDF — malware analysis report

Static analysis result for SHA-256 614080c39b6b7dd4…

MALICIOUS

PDF

75.9 KB Created: 2021-04-05 01:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 636a7b66ea50d6c1428583c1d16d50f1 SHA-1: 8764c02924d80c03da83294f370f1e2395078bbf SHA-256: 614080c39b6b7dd44b40cfd4618e38d22a4f603538ea882e17a74dd63dbb26af
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, suggesting the document's primary purpose is to act as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=jurnal+keperawatan+bblr+pdf PDF link annotation
    • http://favodokoleti.mypressonline.com/teks_burdah.pdfIn PDF document text
    • http://wibebilija.22web.org/sepinenixowesuvow.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/zafesamoxut-bulalibije-vuxegitipaber-tusuwugivabo.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/h6aRkih/86028212897.pdfIn PDF document text
    • http://nupifijaw.getenjoyment.net/14584600731.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/Siihjge/79869895286.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/cwif6jf/logo_quiz_level_312.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/8mihjhV/jajagobetizakifemi.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/hjEichd/instagram_captions_for_girls_smile.pdfIn PDF document text
    • http://xanejog.medianewsonline.com/bipawavixizezisa.pdfIn PDF document text
    • http://wewedaz.iblogger.org/20627350672.pdfIn PDF document text
    • https://cdn.sqhk.co/wodigajamu/UjjbAjg/riruluwumosegikajojubela.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/oihKdmT/free_real_world_football_cup_game_download.pdfIn PDF document text
    • https://zusabave.weebly.com/uploads/1/3/1/4/131406295/f76412.pdfIn PDF document text
    • https://cdn.sqhk.co/nofatazor/RGsgc4t/levorel.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/hjngfpQ/knife_wielding_man_attacks_police.pdfIn PDF document text
    • https://xuxixoxeniti.weebly.com/uploads/1/3/4/5/134585484/venimuzumewip.pdfIn PDF document text
    • https://cdn.sqhk.co/kojariwirip/QocSCje/oneplus_recent_button_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/Jiigiia/75623563589.pdfIn PDF document text
    • https://cdn.sqhk.co/gesaxamadew/cjagPij/atlantis_paradise_island_bahamas_resort_map.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/EYvgfgg/35483777758.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuxakenupe.epizy.com/43424975285.pdfIn PDF document text
    • http://tofilijewok.atwebpages.com/44336854778.pdfIn PDF document text
    • http://zirejivotaw.epizy.com/retukowumopabufibix.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/desasuteritijapivukitefe.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_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 5140 bytes
SHA-256: f1068d7c4ce5b41c24b169fce3e8846e5d3ce35c69a81cdcd7d69e7844a566db
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 10868 bytes
SHA-256: 1446f86a86ff3dce99d12f835883ae0d0b46de67255e65f03061e183a0a4134c