Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2e9a5e6276e870…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 16:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df1e300cf3e01061f64e159702cbc268 SHA-1: 5ce00a498854cba12c29167a092b10f1c9e81165 SHA-256: 9b2e9a5e6276e87097368f889ccb591fd0627a4d659db183a707acdc927521d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bukharaatlanta.com/sites/default/files/file/lijagevakevoxitarufis.pdf In PDF document text
    • http://unite-chem.cn/upload/files/86916285114.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/darivijofewapilag.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/10931333282.pdfIn PDF document text
    • https://bdata.vn/upload/files/kanilajulomijexa.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/82940914327.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/9154622713.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141d4613a9e6---nisabemasi.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/xusedufepuxa.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/ramegeduwawizisanexo.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/kapalirijezepewumemov.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c5926844c---19412709174.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/varisubalexegag.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/jaroxiwirofiduk.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/vulawapikedatizolubirikis.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///87052454987.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/93152174060.pdfIn PDF document text
    • http://domuran.pl/files/file/xunivemebedunebadelew.pdfIn PDF document text
    • https://umartravel.com/files/toneruwojorudimedu.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/19044309805.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/78070030493.pdfIn PDF document text
    • https://tdfstore.it/file/wizifewug.pdfIn PDF document text
    • https://parfumzone.ro/files/file/sefediwezimimefolo.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/90340002866.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/xawinogatonosoverajezunuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=prisoners+of+war+streamPDF 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_off0000c0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F8 10416 bytes
SHA-256: 491dbd1d1291e823953c6d4e47acbb4bac7a6c1970f77f2ee87ae9e1eeec36df
font_01_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 16624 bytes
SHA-256: 1b3f5dc9c5b50310c2a8c767009630e0b1f06108e311fb8e735daaf8db90479c
font_02_sfnt_off00010281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1