Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba03ebc9f3bac1a0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 02:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fddce1d14f1ca95a7aa453dac2558b2e SHA-1: b4a9885fb3b6880388808f8a7a6f32782f13678e SHA-256: ba03ebc9f3bac1a0ec2e1a0c4bf3edd170eb9d18d7b863c86cc3eb9ebdb93096
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 heuristics identified the PDF as a link farm with numerous disposable hosting links, suggesting an attempt to distribute further malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/nanukujifonutadejibi.pdf In PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/zazetelifazeliwiramob.pdfIn PDF document text
    • http://drtamerturan.com/file/36331675999.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/13297660489.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/bilobibajazad.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/topupuxi.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/19326362883.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210910043732.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021092004223710.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/duvomudodovenuleve.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/68396539153.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/43868525475.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/jakuvuzu.pdfIn PDF document text
    • http://abwrva.com/uploads/files/mibuzunobik.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/toxobiwapujaxujelaf.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/vuvakiruponutunekadax.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/xuxapoje.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/87007412907.pdfIn PDF document text
    • http://hangquangauto.com/files/57872393865.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/pewixitapuxikofis.pdfIn PDF document text
    • http://iviltra.lt/images/files/tovisefuxuduvisazegew.pdfIn PDF document text
    • http://wohingltd.com/userfiles/vorasosukopajurulutol.pdfIn PDF document text
    • http://schturman.ru/files/files/46350577609.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161433c3c3f7bb---36632699012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=principles+of+geotechnical+engineering+5th+edition+solution+manual+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_off0000d216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 17504 bytes
SHA-256: 8f5f9256fbae8ba2fc6df1b0b3d39abf652a5c55f647f553af73d013f31db7b8
font_02_sfnt_off00011750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11750 11300 bytes
SHA-256: aea24fab78de802c00da2cd888f182d09059742482f195efbf77c0b8ea9b9693

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