Malicious PDF — malware analysis report

Static analysis result for SHA-256 344a09a463f8b638…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 11:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1b470870f0068abf3f3a8fc3e517b1a SHA-1: 43f83c483db7fd577023dc972f181002bc2d18a2 SHA-256: 344a09a463f8b638c0241b648965f4d761790879133a2847b71bc6d82c3c32a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. One URL, http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7e88359c195f350a3cbc093926b2381e/fenixivebigokeruvalo.pdf, is particularly suspicious as it is hosted on a domain that appears to be used for distributing malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7e88359c195f350a3cbc093926b2381e/fenixivebigokeruvalo.pdf In PDF document text
    • http://elturo.ru/img/upload/files/28409969453.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/gizakobaforukenojazig.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/buxenutedilozobewaworov.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/905678881.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/pisivemir.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/jelivufupasasojoxizilexel.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/41340542168.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/xegudavolojiv.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/dekiverazadava.pdfIn PDF document text
    • http://mastervin.ru/files/file/gewududetomagiwoserodas.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/24418415440.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/92613057002.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/94881321669.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/11101035954.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/nudebozewufakoxex.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/minozidolikasusaxopivu.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/bokonetekibolu.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/8142923320.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109061635573617.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/80618822013.pdfIn PDF document text
    • https://biocoils.com/img/file/51990446464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=androdumpper+apk+download+2021PDF 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_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 10748 bytes
SHA-256: 9b68da3d3befecd5925d7e7062300f2e11141de356e5a6306de689198754030e
font_02_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 17896 bytes
SHA-256: 29b73bb86ab1118d2d9f06ee831fb84d4b1f2902992ec146cde2388fabaf0f3e