Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55e66ca71ccebe5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 11:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f0d8886dbad358857050a3a00bd9203f SHA-1: 5a81d67773b80f173760cd7708a77fa40f9f5ff8 SHA-256: b55e66ca71ccebe5bd852c573f04f9dc8f75f917598b2dd1810efe4fd42fdcff
182 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of redirecting users to external sites aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=lyrical+photo+status+without+watermark PDF link annotation
    • http://rilta.net/userfiles/files/xatetule.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/goxedubotedekaxerapokes.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/96217463056.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/larefe.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/raxamo.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/ponobegadiliruxesezitu.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/12687811553.pdfIn macro / runtime command snippet
    • http://konberdbio.com/upload/files/28136194219.pdfIn macro / runtime command snippet
    • http://files.ibiza-ferien.de/file/vipupexirolikabinawudazob.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/kenikubukatipalomowiduj.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/79559367886.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/sujofekezale.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141639d426e3---45189588214.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/sakitijerazipukikumegi.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/xesap.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/dekigeluzizubizidexukub.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wavev.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/52605631868.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/tiwevur.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/96792401811.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143713d6fe26---moxetawolekakuwedilomug.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/96089283126.pdfIn PDF document text
    • https://linkevicius.com/uploIn macro / runtime command snippet
    • 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_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 10884 bytes
SHA-256: c333b18516adbc692591f324e09d1a136726f33570f66aa7a5695f1b6a98f16c
font_02_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 17920 bytes
SHA-256: f9dad74edda0d53a1943a88d61d9c595d05de5aab38e763554828785c5a1dca5

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