Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac90fceecc7075c7…

MALICIOUS

PDF

73.0 KB Created: 2021-09-25 06:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 668a0d89d76f6af2ff08d497c07292e9 SHA-1: 79eb9b608ddfd2859606304bc2e35e49962170d6 SHA-256: ac90fceecc7075c7f9c0f081ed48d6bc0e1839e4ad4c17f5845da38ff44a4246
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://gaziogluenerji.com/images_upload/files/rewonofatinuzajokiju.pdf In PDF document text
    • http://janaturismointegrato.com/uploads/file/30239804518.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/894432979.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/pigivagarufok.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/sumakazovabenofu.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/zuwebaxuxipoda.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210920222027.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/rupekapi.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/gewelol.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/q3cvaou06nunlc3l948fhdicro/gixefajikofebozipa.pdfIn PDF document text
    • http://infracsap.hu/files/file/rororiwiduvoluv.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/37380694988.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/nujebabipegikelawezimisu.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/92317022134.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/selajanumofeweti.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092108045573499.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/kekabogiva.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109242258404494.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6aad1fed0---9150384526.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/89304915068.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/91926092823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=como+instalar+whatsapp+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_off0000b85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85F 10644 bytes
SHA-256: a1f94d10f3cf012ac0b167c3f7a7eeefa70c1ba4c3c260e0f310f603c001eb40
font_01_sfnt_off0000d092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 18000 bytes
SHA-256: 14ba9d090ce365942c8cccdb72ecf67196b134c08f3fe2a1278e604b2d20a081

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