Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea630888a75acc1c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 14:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d21ef1f70edd93485a237ca0c9fab7a SHA-1: f3824cd0e33944c62100e2deb4beabdc82685a79 SHA-256: ea630888a75acc1ce61b8ae0576ee94a2dd01b85ba754c4a6e2f673dcc338b27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious content. The presence of embedded URLs suggests an attempt to redirect users to attacker-controlled sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=kirito+sao+md PDF link annotation
    • https://youkuvpn.com/upload/files/gemewud.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/30141618876.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/14014972852.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///kugujifidopibiwov.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f676110d0---jigiwavofapi.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/doweguzutapujizanisa.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/wixesalev.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/68646194233.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133825b204fb---fofibuvaxepedodawugaripem.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/nejogijoniwiriza.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/47655548860.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/89649594489.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/87046750558.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/ziwarimaxar.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/76014671087.pdfIn PDF document text
    • https://lazerom.pro/media/file/51627038589.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/67645488936.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/kudezarozukasozu.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/jekubug.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/15803430096.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/fukalof.pdfIn PDF document text
    • http://alptw.com/images/files/90262212948.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/mabujimosiwuporofobatifek.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/giripibafevinova.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/990983184.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_off0000cbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 10116 bytes
SHA-256: bb87ccf7b488e176d3ffcda3b0cf03e546af06dd0839dc673a2e861368e9770a
font_02_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 17968 bytes
SHA-256: c41d2bdab97e4b0374a4ac7ccc025919f9ef262d4b4d8b5da666284e6f12e8c5

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