Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd287d7916444cfe…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 18:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05d670269731911c1382667c9cf98590 SHA-1: 51dbda0c50586aa0f91cf09a519472594e0a9272 SHA-256: fd287d7916444cfe7036bf97171056c79442d53b150f365d932597b6a83c1234
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The presence of numerous external URIs, many on disposable hosting, suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://inwebjor.ru/uplcv?utm_term=the+journalist+and+the+murderer+pdf PDF link annotation
    • http://cesurmakina.com/userfiles/file/396571072.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109080819234395.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/51097440790.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/tosapozer.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/82169953214.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/geketodanag.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/1703196172.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/16779934404.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/42394934745.pdfIn PDF document text
    • http://apicn.net/upload/files/58315691047.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/91992824264.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/ninuneramowepom.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/56932274890.pdfIn PDF document text
    • https://bselink.com/userfiles/file/xuxazolu.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/fexakanibikiperasito.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/62759509885.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210920_061019.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/poxipowoburil.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/nizeweriwiforoj.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/36266802307.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/29117641091.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/kirupawitidusoxejowaj.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/gavufubozigiteberim.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_off0000ad20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD20 15476 bytes
SHA-256: bc27644d5f30ae3d710c1f6e6904c0a03b0420db71e173520c03005de2878a4a
font_01_sfnt_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 10956 bytes
SHA-256: e70b965cf58180abe6b9b29471fa932e4a2c41eabe33e360a5f98c0660206caa
font_02_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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