Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0beda0ab14a7d6…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 10:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffec89ab185ac8cde10d9909bbbf9314 SHA-1: 3cae59d64af73bec9e127dd3de323304f72afbcb SHA-256: dc0beda0ab14a7d63b8c92102b1c7baf44509bd80ffa5ad936c94c9e1c214053
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are structured as link farms or redirects, suggesting an attempt to direct users to potentially harmful websites for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the file's nature as a collection of links on disposable hosting, reinforcing the malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=increase+instagram+followers+without+login PDF link annotation
    • http://iwayman.com/uploadfiles/file/210905225234515893es4mgp.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/josamab.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/84839457271.pdfIn PDF document text
    • http://polipack.ru/content/file/wobutezovejedetidepomel.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/tasokiruroxirewitajoruw.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/12967349180.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8459723b8---64149286554.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210917_FD90F2D48B5E6988.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/nosama.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/87645660722.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/ladud.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6211d9a95---420882795.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/delifilizadisidasukap.pdfIn PDF document text
    • https://pecintajp.com/contents/files/200200143.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/20879279777.pdfIn PDF document text
    • http://symbolfoods.com/files/file///20128241010.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/86863192467.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/xadufurunisuwiruv.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/91444175867.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/doginuvarikani.pdfIn PDF document text
    • https://betsin.org/userfiles/files/9129130312.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/mipetutufodisowimanumu.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/84711503906.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/77984871130.pdfIn PDF document text
    • http://schokofontaenen.de/idata/81396026257.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_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 18300 bytes
SHA-256: 59577dc2472e960c6aa67c42a018a30c1ad09ad2ac13a0a1cbb461c21a84f839
font_01_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 10920 bytes
SHA-256: 3a18db74bc6002199ee3271f0f166f7cc73eb5a019af404b356b4537a239d8c3
font_02_sfnt_off0001154c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1