Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8c8ea7b2f5c740…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 17:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9ed2d0fe144c05938937f7b77c6b5b5 SHA-1: 6312fe3064d26de5eb13ceb13db63c52e21960da SHA-256: cd8c8ea7b2f5c740cd49fb4e607d80140c831b131552ecfe1b8de9ee16fd6e57
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and heuristic firings point to a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/zaken.pdf In PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/jexepinufekotojuxeg.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ot5v5hasfj584mnm8c1p0ft9vg/47185849095.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/89493719466.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210912201613.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kenub.pdfIn PDF document text
    • http://punaide.com/userfiles/files/fuzebafuxitesogomiri.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/xojolodozaw.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/13276203414.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/jukibufadutase.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/tafuwaweji.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/duxodalulanedanime.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/32472287250.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/gatureg.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/suval.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/lujunutofejesubu.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/matazubobugu.pdfIn PDF document text
    • https://digireg.cn/upload/xarufomugix.pdfIn PDF document text
    • http://jngf.cn/files/file/furonejimugaliboregefa.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/mebupa.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614032b323a6d---kifobexasotedoxunemus.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/90644848196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=instagram+apk+android+5PDF 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_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 10736 bytes
SHA-256: 6a7858374f852bb1d6ce9396d822a6a9e1b6c53ee6fc7ec64fddcdd90cf198a7
font_02_sfnt_off000116ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 18292 bytes
SHA-256: 29d9a6fe09b0b835c62f7ed5513b53bc6fb47e468ffc968bede6a87937bf82e2