Malicious PDF — malware analysis report

Static analysis result for SHA-256 abeae79e0bcf1813…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 18:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdd884ad9641ec89d28fc2b00ec8bbd2 SHA-1: 38abcb76089c24c58728db7abd43f7f335f03faf SHA-256: abeae79e0bcf18138b880ef6d0ddfe5657fc565bfffb45729764e58f3ad31e83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1032070a3---keralakusazigez.pdf In PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/65078558243.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/zijez.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/lenudovavutago.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/ravisawapedibi.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/20267392015.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/radomeduju.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/89944528296.pdfIn PDF document text
    • http://winso.tw/userfiles/file/binemigopedenepaxakonid.pdfIn PDF document text
    • http://gojjang.com/uploads/files/nevepuzidepumir.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/bovonevowusekokajet.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/kasedevemetisubesusodetaz.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/gufasigarebila.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/lurugokuwixejiboxujonug.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/kajezomemoxirup.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84191812242.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/84459425758.pdfIn PDF document text
    • https://baptistfriends.org/media/bapexewovezigukeworatoj.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210920_151728.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/rijowamuvoboruwukufata.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/83893910312.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/vixudagomowatawewigarugug.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/78159746772.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3clsfq1ul8opgrtgo6uau29pv1/2379204748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=samsung+galaxy+release+date+in+indiaPDF 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_off0000b00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00D 10860 bytes
SHA-256: fa7f2dcbbdf0002443b35cc0e3558321654707a8f5a90024fbdfca80c1032094
font_01_sfnt_off0000c8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 14372 bytes
SHA-256: 5647f9ba9ff6ec355c0594d6b2600e033ca00e798a6b2bf1641aca05bdbdcd79