Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ca762589b63898…

MALICIOUS

PDF

82.0 KB Created: 2021-10-07 09:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1db53faadbea9cba5ce7fd48872f61ec SHA-1: a9fa2fd869ed9e72770238362e81c9d1e2e6e566 SHA-256: a7ca762589b638987195b752ca4dacc2aab98ba7e6d7b9bc60b8b055c2f61429
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URLs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=army+school+previous+year+paper PDF link annotation
    • http://chuanghuilaw.com/filespath/files/20210921094326.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/litovupab.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/tebotulip.pdfIn PDF document text
    • http://furniture83.com/upload/files/22990895849.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/71181779134.pdfIn PDF document text
    • http://lulanjina.net/upload/files/koxumovijolubiriso.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/84261869924.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210912_125606.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7c5ee7cca127696c2f9ab76bd5444f5b/xotomojusugober.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wetasoliv.pdfIn PDF document text
    • https://egf.tw/test2/images/file/53521700890.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/92147148312.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/12200125613.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/90121431855.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/kujojidofelesewux.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/96035885084.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/97671855260.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/kumefezunubitabenaze.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/45550576495.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/33619790.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109160508473059.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/zanenusanaj.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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 10696 bytes
SHA-256: 1fba6e3f44ab4b5603db56d48ee536affb020c25e308f86b2e54651da91a02b1
font_01_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 18104 bytes
SHA-256: 7e5821c8030c8f19b00b4183b435b0b2cd52b1bcf6f05a76f8b39c59692429cf

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