Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c5c8afa84d1a44…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 07:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06979cb7befd884b212e89337f0919c7 SHA-1: 1c9216b3bcbb78bc2ec94adba5964cee09bad355 SHA-256: 86c5c8afa84d1a4411ae2b9b101b5ff502cbc4bf0e6f0d69b615295c210410ec
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or malware distribution campaign. Heuristics indicate malformed exploit streams and a link farm structure, suggesting an attempt to redirect users to potentially harmful external sites. The presence of numerous embedded URLs, many pointing to suspicious domains, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/dezafofewor.pdf In PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/87888264234.pdfIn PDF document text
    • https://possamaiferramenta.it/uploads/file/suzojelepoverefa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614404e222c7b---5873794176.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/789735253.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/dumabapun.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/sezejiwufexewewigiwebabo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/30538617137.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109290352062526.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/bobakekagegelukitedozo.pdfIn PDF document text
    • http://inica.org/files/file///winapavowaju.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/relagozera.pdfIn PDF document text
    • https://apra.pl/files/file/tudifagibumiwipodise.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/63253290666.pdfIn PDF document text
    • http://shesob.com/file/files/56797517910.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/20742987631.pdfIn PDF document text
    • http://prompol.com/media/file/zewitoxedekiv.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161391c8a015de---waxututu.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/fodoboxurudowi.pdfIn PDF document text
    • https://krusomying.com/data/file/nisoko.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/mawumekolabulol.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/98586832744.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631103302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=avtar+singh+contract+law+ebookPDF 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_off0000ae6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6E 16036 bytes
SHA-256: f275aac4c2286fc80c57ea070af214c0e5fa3746d2de369fc55e38f00f5dec9f
font_01_sfnt_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 10872 bytes
SHA-256: 8eaa903d355fcf88f78d86849f6ab3e44d4fb14f38eaae901a69c5af8ba17fa7