Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcc021c7df89319…

MALICIOUS

PDF

82.6 KB Created: 2021-10-05 08:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df1dcba6d90964046277aebb2f25f3c7 SHA-1: 204ba68460b6274db83274416ad6dacdf80cdd8c SHA-256: adcc021c7df893190a25223f123753b2a09a91c4c1697e8cb17c737e88abc81e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sevvalturizm.com/rsm/files/98549728008.pdf In PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021092806472680554.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6bd20a14a---77633951728.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/36539763647.pdfIn PDF document text
    • http://halanmilk.com/upload/files/54943760533.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/25172804551.pdfIn PDF document text
    • http://sergeybazarov.ru/file/45901393403.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/28143388763.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/jenejumebifo.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/fojalugisobonofub.pdfIn PDF document text
    • https://hoalavender.net/upload/files/jonolodaxenalajopaguj.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b950eab6ac---45158471744.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/dogoxirofivo.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/lexunemed.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/95255348819.pdfIn PDF document text
    • https://totounited.com/contents/files/fexewepunakokowidifuzevu.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/werugopusewow.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/gatow.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/xufunivo.pdfIn PDF document text
    • http://idcla.net/upload/files/xikejeriz.pdfIn PDF document text
    • http://hijoin.hu/editor_up/dukepix.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/satazulemin.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/dodosis.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/28747533635.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/80146691014.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///43951575149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+a+fillable+form+in+pdf+from+wordPDF 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_off0000dbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD1 18384 bytes
SHA-256: 0b0e5a6a5a9848d4672b8d47ce53292e855affca2fab5d47ed7a776e90eff1a9
font_01_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 10800 bytes
SHA-256: 46957840e1c118f42e8cc0c48de3da34931385b5d2ca92c87b78e29d32c36661