Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7441169c7605f6c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 16:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 180e9e6943144d75e45c47d4d1b8e3d0 SHA-1: 0dbdc402744502e66f9436e981c7e288b1e49aa2 SHA-256: f7441169c7605f6cb483b2b4f9d517ce4f0913047dda253b61cc7ae21a7ab0f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the presence of many external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crysiq.ru/uplcv?utm_term=the+king%27s+avatar+season+1+episode+2+english+sub PDF link annotation
    • http://hanasushipickup.com/uploads/files/pirof.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/ruruwijaxumavunig.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/99620423708.pdfIn PDF document text
    • http://standardamulet.com/files/files/11294212575.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/5317594505.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/pavapeposutawebeledev.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/98700613077.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/norisulunepepixunez.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/lunevefuwomusefafu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2f94c5fc81a632854ad5ed985e3b3442/puvuwulebotux.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/46167771999.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/6055586847.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/28683070808.pdfIn PDF document text
    • http://armanetti.com/images/zexigugib.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/97252924467.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/37291306051.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/21877028020.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/dabedibuseba.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/44508908959.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/davogaxofekeneju.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cvhf3eta1qlg8k3cqrlkfvmck/dukew.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/rutukifejefogivekone.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/79470153152.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/75332206224.pdfIn PDF document text
    • 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_off0000c067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC067 17692 bytes
SHA-256: 7ab6bafac6eceb8af4fe56e830d1e58ce94b84b9e9ecb9e117fad07faf68e74b
font_01_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 11236 bytes
SHA-256: 014383a475db225efc7436c81a6818858f5640f73da1f242bea258c980241765