Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9f578f63f9f9c4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 11:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a044b4b394f20ea756a5af4a4b6073f0 SHA-1: 9ceec74ef110c8570e3288a78d2013888001657f SHA-256: 4e9f578f63f9f9c4a9164acf55d2d0d4a6ec769c7d5106d32d5b14137fec2d6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous URLs, including one identified as a link farm, suggests the document is designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://safiorida.dk/operatori/userfiles/file/pofifirenotade.pdf In PDF document text
    • http://sualpturizm.com/userfiles/file/xulovodugiluzukavew.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145051b250c9---78374436720.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///mesod.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/46210607811.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/85881151807.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455441e3e91---mizimudipofadurabozumed.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kariledetanaxuvovinunufe.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/pewumujivonidabupirik.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/noruni.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/razofebobalovubadokiz.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/furuxifenux.pdfIn PDF document text
    • https://grouptm2.com/contents/files/xunagenipide.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/lasunegamonera.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/13919316430.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/776095592.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/73714815556.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/77392344238.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/30893930702.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/29313318266.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/96151035873.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/luxiziligesufadimobew.pdfIn PDF document text
    • http://chenruichem.com/upload/files/19190439662.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/roverosedavozip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=a+quiet+place+2+movie+trailerPDF 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_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 17556 bytes
SHA-256: 8bae641bdef58b78487621fe787268a4aa67416be9b91d545139e01d328a5437
font_01_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 10676 bytes
SHA-256: 4210eedac76600bd0c62718527bc149cce879f376edb2307102b994976e04da4