Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c50e5650eb4464b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 23:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0a5b510b7b1161c8eda81590ba03267 SHA-1: 338789663df4e7b62c9dfbaae1266e855a7cf2c7 SHA-256: 4c50e5650eb4464b13e59ee4cd6fe8d838e55f1103a2230db20dd7c062320094
134 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, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites or to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • 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=backup+entire+android+phone+to+google+drive PDF link annotation
    • https://guapa2.com/admin/fck/file/4555111840.pdfIn PDF document text
    • http://dd-eng.com/files/files/setuwozopen.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210916_07C86362E59A6767.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/15035325410.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210910135816.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/59935026254.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/96235109565.pdfIn PDF document text
    • https://actor-conseil.com/files/file/12307576804.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/wenisegejokopo.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/92990311285.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/dizazuzikogorideg.pdfIn PDF document text
    • https://tckontrola.hr/files/17024881360.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/69158251037.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/goxibuxineki.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/naxekapazobigul.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/kodikagegag.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/neganugizepixalofaw.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/55020940133.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/74501780547.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/mufebozudisuzivepa.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/fasomipebokelikolewadik.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109062101026727.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/47845988134.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_off0000cc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3E 10936 bytes
SHA-256: a878b6677b325957cdaea9c0b47886d596bb9285dfcf190464f096766b2b859a
font_01_sfnt_off0000e55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55A 17584 bytes
SHA-256: 42c2536f08bac343dbbc1aacbacfa2a12999a1219e0ff2fbf26f4a67ca56d8eb
font_02_sfnt_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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