Malicious PDF — malware analysis report

Static analysis result for SHA-256 d691e8ae12b9fc44…

MALICIOUS

PDF

73.6 KB Created: 2021-09-27 00:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8502b8af6ee1917725f567c894e1fb2b SHA-1: 2d3a2e76daf9fd09f5e60390718cc73325f25388 SHA-256: d691e8ae12b9fc445db18365ffb9d39fb3dbc588246ed98798793c6509699c2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=chromecast+screen+android PDF link annotation
    • http://lifecontinues.ru/images/files/mozesazilono.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/javomalujiwovanirinoda.pdfIn PDF document text
    • https://camphacement.vn/upload/files/4816941265.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210915_216A13B77D7909F1.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/28308862674.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/sudujemonoxanutobeg.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/43034276458.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/81507357210.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mafiganenifikelibarap.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/61770239468.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/sesadovokarapetorisino.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16150b4116548f---62323294868.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/joxepusejomabevonakuf.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/ziniwaxubewus.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28008452114.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/2856237526.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/siwazufisidaxiteku.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/54233718466.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/68ffb8108b76c683d5940344d4b33f58/muxonuwanifefinezanipuj.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/23440711907.pdfIn PDF document text
    • https://biomisszio.hu/tmp/29750379471.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/dasikifu.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/50092359892.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/rakavedeleziv.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/gajuvinagotudebakuso.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_off0000ba5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5A 10620 bytes
SHA-256: 97d1907bc1bfd84c27c9f8b1fd6a61ee76f81fb41bf066e2bdb77f75cfe39f79
font_01_sfnt_off0000d27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27B 17660 bytes
SHA-256: 8320a8aea9d6af62d477f372b281522d3cc795868ef42fc3c14825d52f9b4caa
font_02_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1