Malicious PDF — malware analysis report

Static analysis result for SHA-256 2037d4600af20a66…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 09:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d1f64d3936ace297ee2ab7accf57ae1 SHA-1: a7c6acfc9c75b4cde83f9e7bb07094c5cae5fd79 SHA-256: 2037d4600af20a668e9afe494beb33559fbea6671abf6fb1a0dcfaeb284e7e4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing lure by indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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://janjoling.com/public/ckfinder/userfiles/files/nopunojaxezi.pdf In PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/bosakeniludivowowa.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/monitojurulof.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/jodufodolaxagiwo.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/jemoziputagasowudu.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dizexu.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/satujaxi.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/20113255696.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/24042890126.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/sedaburodakiliwulodal.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/16515299460.pdfIn PDF document text
    • http://ausafe.net/images/art/files/10557783268.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/tetudixis.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/megoxejiwitevemudig.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/30853259639.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/70420656139.pdfIn PDF document text
    • https://designclarf.it/file/potafozanasujabuzixuze.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/daduzilemoxedadifoma.pdfIn PDF document text
    • http://djapm.com/userfiles/file/mubado.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59e412cfb---5356915026.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/nubevikuxuve.pdfIn PDF document text
    • http://jiab.net/userData/board/file/24098503526.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/wapanisifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=zombieland+2+double+tap+castPDF 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_off0000bf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 10900 bytes
SHA-256: a2e78ee454761ff4581d55aaf13d8d0ba2310b7d2ff9fde08cb6327131b99de4
font_02_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 17392 bytes
SHA-256: 82ab7eeb375a63418f5da96889d4e4831e844e515ce104e59ca99de40011a8a2

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