Malicious PDF — malware analysis report

Static analysis result for SHA-256 199766625f03dcc6…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 14:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c9f8d60063f13c087d05a7ae2c6e558 SHA-1: 3689afd75a5160947f839327d9584962947fd706 SHA-256: 199766625f03dcc687ff0236bb2ccbc91218427aa3e554d1a072b2e5f66fa9ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://elitsatodorova.com/uploadfiles/file/maxivud.pdf In PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/makovaritu.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/vixixizetonadeketunop.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/48678632438.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/panewilalawaxowesakum.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/35483280033.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210910000206195.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/xifozesuzike.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f039accfa3---riselax.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/847610250.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/sujirebun.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/74933347740.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/51257887572.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/vowukiwekili.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/56493449775.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/nirijugaj.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/mirezolokewet.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/15965118709.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/refebogididuxiramufot.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/73566684879.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/16154010956.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/gozamiweput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cl+words+phonics+listPDF 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_off0000bfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC7 10432 bytes
SHA-256: 8ca2d44103e3522971fe18b2cce79ae2a86f6e1595394d119cae3385924a9b90
font_01_sfnt_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 17656 bytes
SHA-256: 315ead08467142ae2ea7b122fa507ba4b9ea896c7ef36e93c842e8b64c8f8c8f