Malicious PDF — malware analysis report

Static analysis result for SHA-256 f161fe812531de46…

MALICIOUS

PDF

75.6 KB Created: 2021-09-29 11:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcd18aa0f6d52530a8790c294b3dccfd SHA-1: 6ff56c2a9a8d6c911cc15d5891aab2e617e56010 SHA-256: f161fe812531de46f0593df63632693fabc88303db0b133ce1618f9dc98d9ae5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, indicating a link farm or redirection strategy. The PDF structure and embedded content suggest it is designed to lure users to external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=compatibility+view+settings+in+edge+chromium PDF link annotation
    • http://loadcell.vn/Images_upload/files/bopewinoxebudesujodutifes.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/17153689096.pdfIn PDF document text
    • http://portableandcool.com/files/files/nalarizibebapovela.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/52859942916.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/buditokijadatosadelukob.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/50936704957.pdfIn PDF document text
    • http://parateam.cz/file/xuvipaxofofuz.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/tutudakirumojaropaku.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/69625763882.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312c3b39dbc---ditawoxuzifep.pdfIn PDF document text
    • http://brenderup.ro/mm/file/pegisajefabusima.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/28478873975.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/8154785058.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210922142553.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f3b1d5464b346e98b92d8bb928ad7925/67139582215.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/pulejizeranude.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/lesafima.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/tiverojafokudubasad.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/jibulurusatubetijasate.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/gewas.pdfIn PDF document text
    • http://1careglobal.com/upload/files/kupolimatumixekogobuvi.pdfIn PDF document text
    • http://bubb.cn/up_file/file/savoliromuvubisov.pdfIn PDF document text
    • http://balone.net/_upload/file///42280441425.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/mugenusasatekaxa.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_off0000b7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F7 11496 bytes
SHA-256: d26cf75a80fdcc1d4663f8ac08d9f59ec356ef0e91100ef50e4110c3267e0b30
font_01_sfnt_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 20848 bytes
SHA-256: 7a98c760501f450c2bdf7b2a73394d69760c6e470c41f6dece22529c8af1719c