Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b2ac3d30d673ed…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 05:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a87b3a6d81261e61c9e93e2b1b54ce9 SHA-1: 999128dc49d54709c53e65be61fc1c04f1427c5a SHA-256: a8b2ac3d30d673ed6f0227d83632001934987038e2e3ab8bea86a9fd03f32cfe
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kindeeyudee.com/ck_files/files/ninetisufurejeviziguvi.pdf In PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/75892906679.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diwalogemimu.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/20352979496.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/nibuniwagolofodifimalos.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/982fa8bbbe63cd0840cda3b93b04ceb1/67909837299.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109140326244727.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/30715389090.pdfIn PDF document text
    • http://santehnika34.ru/images/file/65383952567.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/kasewo.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/29899436655.pdfIn PDF document text
    • http://simoncaulkin.com/images/25674313266.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nanatavitifefe.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/xirifaxozowula.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/39508503809.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/vogunekexenutafaloxaz.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2a473504fd941d208d2e53031123d6fd/pogixuvamabavopij.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/lalezolovibakojakik.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/92329612320.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/jegukovadobotajixozo.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gapitixitanoj.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/doxuredodovaridatejaxogo.pdfIn PDF document text
    • https://duvanco.be/docs/files/sibatasekugitapazor.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/47066286849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pair+android+to+carPDF 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_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 17608 bytes
SHA-256: 9a48626ade863ca6a675198d0490c4a75433e5f24dd95a4d95f130b8dd1380c7
font_01_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 10016 bytes
SHA-256: 8ce9bf4db7b4b67d42d3be0b10c9e402544020213efd8684650ea01f6a9ac4ba