Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfdcfdafe2aa3c0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 01:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f6f1624903b1f759b2ffe0098aa00fe SHA-1: bdb6f0d195967cf26a7d35b3bf9514144ec5c7a0 SHA-256: 9bfdcfdafe2aa3c04017f489571eac0fdade02840c35d13a30929762bd8e841b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, with numerous distinct hosts and UTM term redirectors, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the embedded URLs point to various PDF files hosted on potentially compromised or malicious domains, likely serving as lures or redirects.

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 http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613617975aebe---876765529.pdf In PDF document text
    • https://posh.hr/files/16694154231.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/xuxubogunarodevani.pdfIn PDF document text
    • https://gangnampools.com/contents/files/91403935229.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/80372786615.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/pebezifuzekugosidumidef.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/69441075799.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/40612395654.pdfIn PDF document text
    • https://europartner2.pl/uploads/vironu.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/zaruvazem.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/74822563582.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161395fce54194---58946883465.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202108311935301335.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/61559811477.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/1579396571.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/xakewu.pdfIn PDF document text
    • http://zenkatsu.dk/files/giduteto.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/96382882992.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/16316152669.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/21617746230.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/bovowun.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/kijigivetexufesozim.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/30665352485.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/xozopetibuxaguseg.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/78798740622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+room+temperature+app+for+androidPDF 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_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 10768 bytes
SHA-256: 09eab3ad64e21fa85128d81fb7e328a3bd868d80c7ae9dda0b69ff5f45c00b11
font_01_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 17424 bytes
SHA-256: 6653a12cbb9b4ebe1624655219dc0baf0e80c3d421293d6839402856382dae66
font_02_sfnt_off00012b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1