Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e8cd3a5fd62bef…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 16:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 667de847c8a28467ffd3944c55db236d SHA-1: 30eaff98c6aa037922bee782f763bfe4c515709e SHA-256: e7e8cd3a5fd62befb080c30e1224b0b6922abbb60ab312809ac0ae61a60aac5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=star+trek+beyond+putlocker', likely lead to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=star+trek+beyond+putlocker PDF link annotation
    • http://yaqeen-eg.com/userfiles/file/fuvibamo.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/5442445485.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/70278706411.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/44661183286.pdfIn PDF document text
    • https://nada70.org/userfiles/file/3965940906.pdfIn PDF document text
    • http://ceroki.com/image/files/42422938183.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36b1bd5ed---12190298196.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/wepevanebakopo.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/derepugovol.pdfIn PDF document text
    • http://onelove.cz/file/65396632976.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/87186549367.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161397e968b91e---wekebutememo.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/42703356925.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/62694734257.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/zapomewasetu.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/vikedofumiruweberomuw.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/96464897434.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/tapesibaxujukatekodudotuk.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/kerarefamupurudexesaribow.pdfIn PDF document text
    • http://soupworld.de/upload/file/jukujolox.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/wojumubipivovezix.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/woxawefobetukokubozix.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/nekazizuli.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/kufimizuzajino.pdfIn PDF document text
    • http://sushibelovo.ru/files/levesujelarixulabofoke.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://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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 10768 bytes
SHA-256: ceac748fda88c09e02874b1fac2d9951be8ffbf89c76df050d8e018993b736b3
font_01_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 17192 bytes
SHA-256: 0b060e446a432c24222d9ae8dcfe9e03ad45cb9df53a947db27f70f533d0c242