Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba12399ef02ec50…

MALICIOUS

PDF

74.7 KB Created: 2021-09-09 05:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a57e865ebf1acea0a3093fef2f7f97b SHA-1: 08aab58665cc59734fbb62080ab6fe85a01face0 SHA-256: dba12399ef02ec50fcee888a78a0823ab8dd1f083db304ec5f56b13cf3822016
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external links are consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://piri-piri.pl/ckfinder/userfiles/files/fevumoluvunuzenimoworal.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece6a4d525---bajetaz.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/tqujrmjchfgu4u7pugij9n8vi1/99092021603.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/38754487890.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/vunob.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/zekinib.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/21723878107.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/lixuxifefosakonuxemin.pdfIn PDF document text
    • http://darec.sk/files/files/44007112525.pdfIn PDF document text
    • https://mmtours.si/uploads/48677696911.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210903131554782.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/pedikixenorad.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109061344259019.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/dibigixogikukidogefogiboz.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/32251142860.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/segeb.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/wewakokuxuxe.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/rewavujemabinok.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/37754087020.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/lulokavinivilelefozeka.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/gezitanoniwuzikufif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cut+tari+igPDF 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_off0000bfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB4 18400 bytes
SHA-256: 597c51f548d7f5a3cf512f72bac0807a79e6911ce29b34a23cc8d9f25b854edf
font_01_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 9844 bytes
SHA-256: 0a7859d4a7abcfbcb33b27a9d0fabb446631d54367fa7be1d07ebe6148cd8c95
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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