Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a243133ca07fa2…

MALICIOUS

PDF

74.0 KB Created: 2021-10-02 22:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 966a545129538939bd65662adabcce52 SHA-1: 201e9e291568afa391c9f88bb0a31c4037de526e SHA-256: 83a243133ca07fa2483dbd2418472f45286d80c34c78bd37025e4db42c5d89d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=federal+civil+forfeiture PDF link annotation
    • http://9y.bfage.com/upload/files/20210928043410.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/rubedetolo.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/nesafevofurolesiwin.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/winomifogulelojojiw.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/14415551208.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/67417645213.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/60384904199.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/gizudunaboki.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/geroxam.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/49750849290.pdfIn PDF document text
    • http://thecuriosityshot.com/mobenaxugazezuvu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614e28aef3043---48748220688.pdfIn PDF document text
    • http://clingac.es/d/files/liteliwugixotofoxoman.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/48790083791.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/tatawokisanutezaxijari.pdfIn PDF document text
    • https://viettrungson.com/media/Files/dimotek.pdfIn PDF document text
    • http://web5gstore.com/Files/files/45676389688.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/kitovekoxa.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/rupiwazuvujanavenoxo.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/66770369708.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/nusigifunejegojeletijik.pdfIn PDF document text
    • http://balone.net/_upload/file///govunelavomeliwek.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/nanogetilupogew.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/fevanofezawex.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_off0000b97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97C 19732 bytes
SHA-256: 91aa22f5db3a3f4d37fb06d3f7d8f7ecc458c35e179edc1e7d56f9d627424076
font_01_sfnt_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 10340 bytes
SHA-256: 478f6463b68ab91e74ca7cc4ed09af43825c03fefcd77d723cc640b362f97ee8
font_02_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.