Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c87002f16a764f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-18 15:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ea11dcae37e5ba39af902ea0adfb59ad SHA-1: fdfba2a7172649d5f912b4feb1dad663cee21ff3 SHA-256: 87c87002f16a764f3c13a87107c2a4eae465052810f635d9df7c416389567ee8
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://chalappuram.com/userfiles/file/34004421150.pdf In PDF document text
    • https://fond.ru/userfiles/file/xifetavadenumew.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/22cf61716ae8470445ba521b43ab8ad1/42675488621.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/51192658051.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/morugajilevefogasezixesov.pdfIn PDF document text
    • http://888chji.com/userfiles/files/6214458772.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/85812872986.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/gajuwuwumetur.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/lojawumaxesagiwidolimip.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/visozisazugejivutaxes.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/9786464215.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/migixipizawunotu.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/mugako.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/78119150844.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/77322829260.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/degeseviru.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/99031043762.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/32886664811.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/tuvumipowawozarikuvas.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210908_8B8367242C08D3CB.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210907191548.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/burukilatajiki.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/nozaxitexavamubobaboj.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/82185703645.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/zokalefokusus.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/26709295655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pocket+camp+animal+crossing+apkPDF 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_off0000b5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A3 15308 bytes
SHA-256: 56115f3573abef10b9c1f7ab168908393af63f201e2aac90cb076709361b742a
font_01_sfnt_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 10808 bytes
SHA-256: 1a7f4a04c7d34291cf62482d71b4b80ea2d947750db5be1edb9a9636f98f7f7a
font_02_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1