Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45287d677731732…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 18:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c19c407b1c1de269a016d67389fc54fd SHA-1: 6bb2c88c2ddc289ff9e7744c6ad9c894575a1f32 SHA-256: f45287d677731732f94a0967c12e94472a201e4f035e1e8bf9fe9f1fea7498d5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pistant.ru/uplcv?utm_term=how+to+get+rid+of+ads+from+your+phone PDF link annotation
    • https://shian-jin.com/UserFiles/files/misik.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/62373649208.pdfIn PDF document text
    • http://yongqingtech.com/d/files/34053349852.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/5658222950.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/nefomixurug.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/66051249885.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909100936.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109121021368029.pdfIn PDF document text
    • https://sanidom.pl/img/file/73740118729.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/34821368359.pdfIn PDF document text
    • http://praguetransfer.com/files/file/32086252870.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/vazixudulexewakugaw.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/6478462912.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/pixajozomo.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/dipofazimobiso.pdfIn PDF document text
    • https://fishuntpesca.it/file/xivujivuzubut.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/6284521463.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0fd892ab---20076774725.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/75366398042.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/zisusufokakogafapa.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/411254749613e3e6312092.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/20780427492.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613627a3a43c3---janaporoxuxejugur.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/xigetasesutiguvuwile.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/83021668191.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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 18500 bytes
SHA-256: 173b80e253f1115dcc30bdce4ce19027150d3d9a18213a871abf6cafe4201b62
font_01_sfnt_off0001133f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B56 11192 bytes
SHA-256: dd2f1c69fc8713474600c5177b5d46522cf9618845f8b715b174131bc6d08b13