Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddc6ba6bf1ab5ed…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 18:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42bf334a9abbcbc4471cdde22074d8b6 SHA-1: 6708940af002492b7fb3cc2c8bf03e6a248cf060 SHA-256: 9ddc6ba6bf1ab5ed1f41b281c7293606b3583e4c9f3986fc1979b3dfec9fdeac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://travelone.ae/userfiles/files/91873142161.pdf In PDF document text
    • https://faceless.me/userfiles/files/momifuravizonib.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/89185625609.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/36523007224.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614815b4ade48---36038307767.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/fepirakexubaxune.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/86834367279.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/96211015626.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/kemukujunaxaga.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/wularutu.pdfIn PDF document text
    • https://angkalaris.com/contents/files/josepitoxobirowumukotaki.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/90434449279.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa1a9c9ec---zikutilurawotewigurekuza.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/vabasejufotezi.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/tanukovigeronunabiwe.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/62602370417.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/81783436694.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/98817833773.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/49841182096.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/xugabewikavavazogitij.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/vedejozunadaxebibawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=infinite+flight+simulator+android+downloadPDF 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_off0000ccf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 18844 bytes
SHA-256: 44aa92448f18b0cc323dcbf08dc2c5e244c3805ab9bd9430c759504fa027ea81
font_02_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 10936 bytes
SHA-256: 2aac45c015a83f11d97ce5f93633e94632cadfa32699cef4ecdb06b27894ba18