Malicious PDF — malware analysis report

Static analysis result for SHA-256 c114660f86df0822…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 00:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ff53a6f7d5b4b220e423970e5f753c9 SHA-1: 90e6219c8ef984485d25b7da669431cda01b00db SHA-256: c114660f86df082248fff87adc4a7212116bf7b0b95de00ee72556ffde981f05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The file contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The presence of these URLs and the overall detection profile strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1b492031---92978662764.pdf In PDF document text
    • http://chip-chup.hu/upload/file/funasavogateramowof.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/89239802412.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/jitozagi.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/15627654650.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/55450889410.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145d5c65b528---nivelidesiginikereremoveg.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/73100094517.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/53618396306.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lalosifup.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/88220974944.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/34510473308.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/36738192583.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/lizat.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/50373478924.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/58832734355.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/70759028301.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/69435811608.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/motopujuximisebi.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/bepupaduxorutaxewaw.pdfIn PDF document text
    • https://tigaintan.com/contents/files/42910231189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=first+aid+for+the+usmle+step+2+ck+pdfPDF 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_off0000cbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 11072 bytes
SHA-256: 692ed30f9248f38703a11e86a95fd07607a95b248735076e7617acb089ab513e
font_02_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 18672 bytes
SHA-256: 29a11871dfce9427235c53112c12f2148e14dee11f9a6fa597036c94049349ed

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