Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c61e76a24c1adb3…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 06:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7a50ca348b4ebfa65d3d7317a241e100 SHA-1: a37513075466b10d3c3e7c857e6c6652994e6627 SHA-256: 4c61e76a24c1adb32702b936e37ded4b29282575601ddafb85d6ca1ffc4a3b50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on disposable domains, suggesting a link farm designed to obscure the ultimate malicious destination. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://cupta.org/userfiles/files/20210919175455.pdf In PDF document text
    • https://4of100churchstreet.com/assets/media/files/fubarowixoluxurafogopa.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/17165468552.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/35315848666.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/65498130404.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/gisoled.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/relimakozodapiroval.pdfIn PDF document text
    • http://epicridesnepal.com/files/bulujaluxo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156b4ce75fcf---nezefefamujomubam.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/35159d690403ee91ba2d71b322576aaa/nimafewo.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/4828068936.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/jipomolesasulobamo.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/wetukemam.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/julokosezunafepozujopisew.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/vidazowusorux.pdfIn PDF document text
    • https://aedwea.com/upload/foto/79842923266.pdfIn PDF document text
    • https://spyboarcams.com/files/gekalawiwusemuzexosopama.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/rewitafaxonufixiduwom.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/9204071945.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/sujinizonuj.pdfIn PDF document text
    • https://casaalu.com/luutru/files/bikimuzitev.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/5459125192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sample+letter+of+not+renewing+contract+to+employerPDF 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_off0000b04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04B 10932 bytes
SHA-256: 48db9e2168a0df9a2f62d5811234e2012729f523edd17e10c0a6d75b4e1a6dc4
font_01_sfnt_off0000c9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AB 14580 bytes
SHA-256: fe9cc55502ce14dd1f9ee9c53004d5c1e6fad008d65458065de395882c7c4147
font_02_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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