Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa962e04032ee68…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 04:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5e0a1b90795ff0e460847e8a0ab6a1c SHA-1: f508646ab11acec326876310ce2dab82b14c9d87 SHA-256: 1fa962e04032ee6879a4ac1534f3a668b591396bb141fe4dbf58afd484ad0e9b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and external URIs, indicating malicious intent. The heuristic 'SE_REMOTE_SUPPORT_LURE' strongly suggests the document's purpose is to trick the user into installing remote support tools. The ML classifier and ClamAV detection further support the malicious verdict, pointing towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=remote+control+app+for+android+mobile PDF link annotation
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/lejazenisekab.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/49203253934.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/10257964298.pdfIn PDF document text
    • http://neteyes.eu/editor_up/89737165564.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/kaludotovu.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630508471.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/fubelaxibenemilo.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/kamalomanavevadazar.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/47638014082.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/83868626689.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kafekudim.pdfIn PDF document text
    • http://biosite.ru/images/news/file/95312127997.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/20039436215.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8922dd0e7---33679655444.pdfIn PDF document text
    • http://ipllaser.in/uploads/65001272851.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/zovanupafuvulo.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/visogapivewelaniroxu.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/ximosokavominujir.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/25653056578.pdfIn PDF document text
    • https://interconformity.ro/images/file/likukixikotinufejow.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/81945895237.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/bc3d6fdb2374494d4262a7c125809033/vomunagenilikufavaji.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/muduripejudedeno.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/73609351683.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_off0000c580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC580 17428 bytes
SHA-256: 2df2b5ec4e095f9124dd20ebfbfe2efe4180a32494d4f15c4aea22a57e29e297
font_01_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 10796 bytes
SHA-256: 4ebbd6324a4c908be06d664a20ea8d9a0571b7d6229f0ff72268deaa76bd8ff0