Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e81c2129b173cc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 22:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17d03b86624a058a9b78078f85bd625e SHA-1: b0ad747dc8779a783dae6d7acafd7c059b3a951c SHA-256: e9e81c2129b173cc8826b7a4068e0412f356e721d43f189ce84291b3447714a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features a large number of external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://519pf.com/userfiles/files/jagijunodanujotonakimuka.pdf In PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/91168591001.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/82960164712.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/20738705134.pdfIn PDF document text
    • http://pedraferro.com/files/files/83464296745.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/55727275165.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/lomewagudiwev.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/lazimewemisoged.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/4054161492.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/83354874148.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/lobatetakiwazotadosebepu.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210905214919.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/fegazakijabobeb.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/davunafezizesifi.pdfIn PDF document text
    • http://metall-press.ru/files/vozumigegiraxifexus.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/3725703557.pdfIn PDF document text
    • https://alpinashop.bg/files/dipifin.pdfIn PDF document text
    • http://bamor.org/userfiles/file/xogewazeranigolekoga.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d8ce5061---jututurajirepinunuto.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/gukuxovujivus.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/87717106094.pdfIn PDF document text
    • http://petrduchek.com/files/74476923916.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/zitizuzubilon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=einstein+gravity+in+a+nutshell+pdf+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 11124 bytes
SHA-256: 05ed5e7877e8ba25e7b4380c921f2feb05ebb07f26db6fb3932391464d304ff1
font_01_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 18436 bytes
SHA-256: 6a4607765c08dd897271ffc1402a2a1d45535f8e5742d44599aa1e187f7e016e
font_02_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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