Malicious PDF — malware analysis report

Static analysis result for SHA-256 58918607ab5ba7f0…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 12:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f1d68f73b34bf5ee7a1c15d03812ed28 SHA-1: 901d653c0412a18fcd7f991218a44edd1d8cab12 SHA-256: 58918607ab5ba7f08d12d62bd79da466f93c6c5e51edfd68e76287b4710c7d88
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicating a pattern of linking to many distinct, potentially disposable hosts. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple unknown URLs supports the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.hangmandigital.com/files/file/gixufezeludexe.pdf In PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/14820290085.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/44038353999.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/93956183936.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/siwamufepa.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210913142451.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/xonukexixupuxosatovofofis.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-6/20210906034832518531.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/fakofidaxamewotudagi.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/29480860941.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/95179395528.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/24956737193.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/bidevik.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/9965526760.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/97110275559.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/jedapatiper.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-28/20210928190437563742.pdfIn PDF document text
    • http://ctm.it/userfiles/file/673003411.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/nonosikewovumifenevika.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/45685366414.pdfIn PDF document text
    • http://guowangcable.com/d/files/labevixerujowe.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/limazirugogusexelaw.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/bebifonupip.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/totaxidopinomemes.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614822e6bffb3---dezutefo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec555e3038---95827000839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mass+of+1+amu+in+gramsPDF 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_off0000b100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC912 14540 bytes
SHA-256: ae12612e325ee0bec2e0835267fac155eb94cd9477b77f19fd1ea6077fddb7e4
font_02_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 10428 bytes
SHA-256: b2585b7904d0008e43eb576394b131e9004dbc3c701926434d9f2de13afb2dcc