Malicious PDF — malware analysis report

Static analysis result for SHA-256 416e73bc2758827d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 10:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7a92b44e089a8366d4077fd077cd68c3 SHA-1: eb1defd1e33a2cfce84dee756f53a6a116977995 SHA-256: 416e73bc2758827d8f739e81f42cf1f875d51f0778d317571e8a8ef52e2d2833
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. 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 heuristic firings point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=android+print+text PDF link annotation
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80645903175.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/12274106442.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/14109838195.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/sasubutolel.pdfIn PDF document text
    • http://philipsphotographystudio.com/26457292853.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/51808521870.pdfIn PDF document text
    • https://priscar.com/documents/files/64338968948.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6a3d6ad80---mavixawapukuzifaxowera.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/29388802077.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/zelitemakizum.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/50302405226.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/zedavopefevanofusuwujex.pdfIn PDF document text
    • http://winso.tw/userfiles/file/32752346899.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/65117266752.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/sebawujobuvukemuzebeze.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/rabapewaputiraxokev.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/memax.pdfIn PDF document text
    • http://axwelindia.com/uploads/jifisur.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/lasutuxavipuwakukikigob.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/41125897384.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/japutiremifatebijabum.pdfIn PDF document text
    • http://chamdure.com/DATA/files/kowotejozukixoburebogix.pdfIn PDF document text
    • http://elskenecologie.nl/files/pozupiwesif.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc6f109b18---sivifetanuboxoxeresiwo.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_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 10092 bytes
SHA-256: caa3c2792ba784eef35800d2b89a27a4c89e2f4b9949b4cb171df2b8e60579dd
font_01_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 18096 bytes
SHA-256: 1592bd4e00b5648ffc12799fa823063821fafe19ba1803e29f18095942976bad