Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b62783d2e6c5d9f…

MALICIOUS

PDF

75.2 KB Created: 2021-10-02 10:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f1cf0a735f06a5a4c8be9efeaa6e84f SHA-1: bd12575148e9b3a2775a39fddea4735a7c49dc30 SHA-256: 8b62783d2e6c5d9f6a427068800577872b9450b45ac9ae80119f5209b1fdffb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to distinct, potentially disposable domains, suggesting a phishing or redirection scheme. The embedded URLs, while many are marked benign, point to a pattern of hosting malicious content on various sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/75879944384.pdf In PDF document text
    • http://lica-mpt.it/userfiles/files/47268344190.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/26465896590.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/21318412858.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/80741981108.pdfIn PDF document text
    • http://mfcpavpos.ru/file/84793067222.pdfIn PDF document text
    • https://equinox-e.com/upload/files/veziduvunogukuxov.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/fapagavibufolisamefebi.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/90354086247.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/vexulinidozogatobijedux.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/92866101740.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/wotave.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///nuxavusoxuwazoloxawiris.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/vugepuvogerejotoz.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/fapukusivijasasomogavorof.pdfIn PDF document text
    • http://fullx.net/files/28044046524.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/17556704253.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/tutaxosewopobenamovivaw.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/17100918269.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/nasevijomek.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/50657121767.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/4967799679.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/757d51eafd99e8c1bfdef990d0d6159d/84221524123.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/89554449959.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/75595023504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+fast+should+you+be+able+to+run+a+milePDF 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_off0000bf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF28 17984 bytes
SHA-256: 4823d2e81ee9ac527ce4457c2df266e1cd45bcb66c04a5417afbe490ff72d295
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 11052 bytes
SHA-256: 4e339f9fc7a219e532597af00d43256387861c134b674274dc333cb84a0f9798
font_02_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1