Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfce9b0963bd93a4…

MALICIOUS

PDF

90.0 KB Created: 2021-10-01 08:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 345c128d8e30378248588c7950d19ee3 SHA-1: 81ca74f260932ce425d8d7e17bb8ab3716edfbcf SHA-256: cfce9b0963bd93a41b34a9cdc9fe551e7c32cb8efcb518de973579f7eb0d2703
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it contains numerous links to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the PDF and its embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bor-diing.com/upload/files/41821653636.pdf In PDF document text
    • https://pvesc.vn/uploaded/file/mezesefilimo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321adcc6488---zojimofumefebeli.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/95932803929.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021913828595155.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/zinoforilarizodi.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/panovilufipoxama.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/57128558518.pdfIn PDF document text
    • https://ever-progress.com/upload/files/gimogejipegosufumi.pdfIn PDF document text
    • http://allergyc.news-read.com/upload/files/negaj.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/79047907411.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/19035154736.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/3698595701.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219221550103244.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/81092502736.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/dikuzubijegudobojafuxev.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/fomagarikode.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/dijixamevewafara.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d7c6962f4---47962407064.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/wivepi.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/50423363872.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210906152221.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/12164423674.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/23614557622.pdfIn PDF document text
    • http://kelvista.lt/images/files/51815865409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+walking+dead+season+10+torrent+downloadPDF 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_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 10840 bytes
SHA-256: 91494779ed84728a6d9b92e9346a3a951c07a2293bb51d30a8098532ab446522
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 21632 bytes
SHA-256: 96806c7c1a7469cd32cca146ee212e4c7fd338a1b9421f9b750ec8790e19b740