Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e63054ef9e107fe…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 04:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24a593c3043ef4bfb8e5835a18b31470 SHA-1: 8a07b2b283dc364b6b891969633fab465c444819 SHA-256: 8e63054ef9e107fe3bc1cc6258c74b56f65c0732f9610fe6cf9240d8ad0d2b59
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating it is a link farm and directs users to algorithmically generated URLs, with one specific URL being flagged as malicious. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ambulatorioveterinarioilghirlandaio.it/userfiles/files/52233521648.pdf In PDF document text
    • http://lindendirect.com/tempimg/file/gebimiwonutuxetebo.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/jisojeganosunu.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/33052576055.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/zaregebekodexesek.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-9/20210909000046536041.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/12599056979.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/gitunorexelujizanas.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614029e6e5494---11093759904.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/70051474101.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rj3kmes7uvj35r8j3ph7opa206/44801593017.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/79277628550.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630901011.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/kezoludokofajo.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/94998287392.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/86726059074.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/jobegivisuzazukuse.pdfIn PDF document text
    • https://papiratisk.cz/soubory/winowe.pdfIn PDF document text
    • https://keongracun.org/contents/files/woduvi.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/16/woxijipovokirefifaj.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/sugen.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/59799205289.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/sanexofixevatumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=compare+plugin+notepad%2B%2B+64+bit+downloadPDF 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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 18288 bytes
SHA-256: 97ca454f121919f80b77d02a18fbf8578dcbff7b3cb666652a173ed3610af053
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 11172 bytes
SHA-256: 3ebfbb989852737d4caa5c9ff6b34605e0aea60e85f79bc6dbe35bb63690cdbe
font_02_sfnt_off0001260c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1