Malicious PDF — malware analysis report

Static analysis result for SHA-256 f812d845dfebf6aa…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 22:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 223c2b485e37b633cd8907240ec6a9fe SHA-1: 56ce9cc0b07ff2a571fafc3ad7281aaf6db41e08 SHA-256: f812d845dfebf6aa2ea8cac63bb04e0914d96c873104e3dca7aa89756db0e1ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm hosted on disposable domains, with numerous embedded URLs pointing to external sites. The primary URL identified is https://synerhu.ru/uplcv?utm_term=super+p+launcher, suggesting a phishing or malware distribution attempt.

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 https://synerhu.ru/uplcv?utm_term=super+p+launcher PDF link annotation
    • http://greenbiotech.vn/uploads/userfiles/file/juvejiraziwirisezije.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/46288252973.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/85469975501.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/pepiguvawexe.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/34210622496.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a3d3bbcf8c7fa0ac1be23dd0ed6d95ce/gerujukibesasuwefivot.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/30119975111.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/kasipenodisegewuvo.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/6999105514.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/2909697123.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/zapesi.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/39291749689.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/jokivuvexamuz.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210911162606_164812224.pdfIn PDF document text
    • https://campermagazine.tv/public/file/94167047518.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/suxajepowok.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/66239968934.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/sijaguz.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613866d1a48b2---kajepelafutulojowomozu.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/dilimaxerezalugomafobup.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/68056215998.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/kawevifa.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219213824138.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/54938955712.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_off0000d3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B8 18384 bytes
SHA-256: c7502175d0b5883f2b5695d843367ee55b705adfe709d45724b8d3d7d53e1323
font_01_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 10168 bytes
SHA-256: 4809e97046798efb8092dc7131f0111ce198d6b24b6bee2d25df8273609eaf20
font_02_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1