Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb61d146df8cd107…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 20:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a4b26de25ea9674bc4e3968b3862e7b SHA-1: 44b9f235cc5e67cfb2f5a60d4036a147f32bebd2 SHA-256: cb61d146df8cd10723c2b70ae96d17f18f1c454e122e7358420aff633badd2d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous unknown URLs supports the attack pattern of luring users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://architects-desk.com/uploadsfile/40237220648.pdf In PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/rufadoratisemo.pdfIn PDF document text
    • http://live-net.it/file/ditofekakosizenutirudore.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/bogojopabilironagiferemu.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/47043346203.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/selola.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/88318564034.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gifutet.pdfIn PDF document text
    • https://foodbiz.bdata.link/upload/files/25415314127.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/32462788092.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109302156072988.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/zuboxugideraviziwe.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/migivijodujuferumurese.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/90074179301.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/wikesuwapabodijelo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422ef86fa8---24116918896.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/9988110284.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/desejef.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/6900039073.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/91204939282.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/32673621815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+connect+my+phone+to+tv+using+usbPDF 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_off0000b002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB002 11152 bytes
SHA-256: 3f17d88d75776595353a79703a3b02a9351e99dae840246ce22783fd2e29181d
font_01_sfnt_off0000c974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC974 15664 bytes
SHA-256: 3b0938fdc1f1cc7521ae28e2928651ef5f3de95f07cae2fa36359c104ab1ff41
font_02_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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