Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a190b0d04dca1ba…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 08:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b4f14ff378f1a09329646df4a390da4f SHA-1: 9db4038148922c6d316ae5194c28d21f655c346c SHA-256: 7a190b0d04dca1ba8dc5f29c3c1a0680e358fb2177370d245377484ef3a3a7ff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dadesigning.com/daduserfiles/files/13013120044.pdf In PDF document text
    • http://p-energo.ru/content/file/69213439039.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/sexowedi.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/26994045556.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/woxaxufatuzagupe.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/35881634683.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/sewazanebitoredogeweja.pdfIn PDF document text
    • http://rurisnet.org/images/file/nagururiromuxe.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/67194754850.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/12188205151.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a354cc6d---taposikaxuwomupenanipoxol.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/xozuvuzuxag.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/motisenegubakejawonuwiti.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/51878007443.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/57032360984.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/lasixogozowurifub.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/95847786929.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/mepixunotenusamaninav.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/61522646997.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/11/60747413816.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/52482369961.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/tokizutuwexasofomutakut.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/56488182788.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/sowubifumonora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=watch+the+house+that+jack+built+online+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 18140 bytes
SHA-256: b130c3adfee3db431432b5214387f8863b796ab7f6c542698bf405721a5853a5
font_02_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 16204 bytes
SHA-256: 3f1eec8191f35fe5bf32c3b349a4df031340d2c179085a10cb9d4ec5a4ccb003
font_03_sfnt_off00012992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 10888 bytes
SHA-256: 7b40565808d6e070920978de54157a26e1f64ab1e00ca59501646ee5b3587718