Malicious PDF — malware analysis report

Static analysis result for SHA-256 927b5c74fac2ac34…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 15:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fcf8db9d52cc4291ea29b3f40f63f5ec SHA-1: f9956fb5866d396a4f70dc809fe4e3d54bbe2ac3 SHA-256: 927b5c74fac2ac344968bd0dab857a9284ed32d3ffdd09f9896d3336489ed319
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the PDF's purpose is to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential exploitation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://osikovo.eu/webroot/img/content/files/50454964573.pdf In PDF document text
    • http://bolt.fo/public_html/userfiles/files/51418175566.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/53943280625.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/tafamawunakiko.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/todekafexuxapudax.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/57961313767.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/71510103387.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/radem.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613159051f49c---73385907775.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/98591526490.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/74478335476.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140c0eaec31a---6301970920.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/tedokulilupenojose.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/81618196261.pdfIn PDF document text
    • http://kccmaul.com/files/files/woxelofefurenaxivovo.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/35135413249.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/damav.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/4610096872.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/79127523480.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210901_110523.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/zurokodugizowidamanifeko.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/84296972993.pdfIn PDF document text
    • https://digireg.dk/upload/8105238637.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/549179504.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/ludedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=salient+eye+app+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_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 10392 bytes
SHA-256: e80b4615cf28c435f474c7cc94b533639c93335cf1c70579276469cddaef9941
font_01_sfnt_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 18468 bytes
SHA-256: 52972fca6ff9a942604b97177c67077cb9deba5fb60ac537d3e36a3e0cb9479f