Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e9366f4a742861…

MALICIOUS

PDF

70.7 KB Created: 2021-09-09 13:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 290190016a9ebec3e6a5cd4550c5a3e8 SHA-1: ec56f32135225b821a41bc25199437e0f1c1cb49 SHA-256: 43e9366f4a742861b07e830c335c5dbfc000f3d97da184a1cb187e6327c89359
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. ClamAV and an ML classifier flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=buried+town+mod+apk PDF link annotation
    • http://bannermaul.com/userData/board/file/27190338280.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/danujawizopup.pdfIn PDF document text
    • http://yibetter.com/data/files/33772352067.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/92263727402.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/wozifilonuseporixog.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/tewotibuxalekive.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210902_084612.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613447b08c83a---jazizawokowan.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/xabamefidi.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/kadizafeg.pdfIn PDF document text
    • http://gro-felix.si/uploads/65272153123.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/72623361509.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/razaxu.pdfIn PDF document text
    • http://hbaoge.com/upload/files/42376484592.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/sakazafidane.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/18744746388.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/zibedumilijuvuru.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/jenaminipoposubokifepa.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/45572337901.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/mejewuwerigodusabosax.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/futijakawidoke.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/66110981222.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/panumejirunulu.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_off0000b20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20D 10672 bytes
SHA-256: 33832f696844579f7ad564bed2dd91d1bbb61b82dbe1871bd0e24d7f33877ab6
font_01_sfnt_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 16796 bytes
SHA-256: 4f81d453f5c8ebc9a9a7194da043ea5f72bfb434ef416f22ed5002ebfbb6c007
font_02_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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