Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7c8602addad74f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 21:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 715574cbd8ad81c06cf539ab50378ee6 SHA-1: 2d02eae5bfe2b11eaebfb5f1d4bf8d2aff031d69 SHA-256: de7c8602addad74fbcfbbe20c81e7e1008966502907a91b38a7df5c0632f1207
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to funnel users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://yingzhaoliuart.com/upload/file/diwijutudafalod.pdf In PDF document text
    • http://bbfederico2.net/userfiles/file/52402013877.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/kebuvomejamoxudulunol.pdfIn PDF document text
    • http://machulski.com/public/file/54039779027.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/94041849720.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/48682036161.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/57925759788.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/61179991916.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gugonuwibosutisasasojoval.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/tegoj.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/pavofuwa.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa81aeb1a7---85605433677.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/jesopugetutodavifosulavak.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109100709125971.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/48951087060.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/65431297836.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5556de8e---79236700575.pdfIn PDF document text
    • http://rotang.net/userfiles/file/zuduvenaparadojewa.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/jofuxalofedemepaju.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/55480235204.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/mamime.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/dajinokalukegoruraki.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/65418056359.pdfIn PDF document text
    • https://nls.vn/upload/files/23411530365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=psp+best+graphicsPDF 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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 10524 bytes
SHA-256: 59e2d8e047fd71c17ec8c9f2041f2df812893d85f933247c2223d16ef6c052c7
font_02_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 17544 bytes
SHA-256: b4d38604055c1ccecc9e3a1e6facdbc00c5e0c55ed55e18904e4cd47d188749e

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