Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad90d188f22247ec…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 12:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac6aa2bfab007df9bba903da5e317ffa SHA-1: 69aee818ca14bbdb6b09ad9f593efe7e135b9c0f SHA-256: ad90d188f22247ecacb6c5b1ba70a33d1d550ec69a8f50d5376480bed6f4f4cf
146 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to exploit users, likely through social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://jatechkj.pl/upload/fck/file/11791421000.pdf In PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/zaluragadilikumema.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/wunoguvegepugobune.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/75745218537.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/79160360179.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/45332927542.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/lipudit.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/didanikunutasokusina.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/getizevolezajemaretokega.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/rujetadiso.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/logaxusozisan.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/47235683245.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/mobusokekasa.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/kumorufi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a2deac1dde51d2a0c75c8b0dd567de62/92583046162.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/772333111.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/9219919750.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/55912802301.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/zaludaf.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/82325336354.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133160fe1c64---69548417584.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/35744101782.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/simotutepapu.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/nixutowewizum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=end+to+end+encryption+androidPDF link annotation
    • 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_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 18948 bytes
SHA-256: 1302fe3524d329457026d8064a953bde53f71d967bb39a02622fa9985a27dd36
font_01_sfnt_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 10392 bytes
SHA-256: 573118edb50885ede32849cdee274c180bb489a8bde2a5e5254d635dcb440421
font_02_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1