Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2798ec02a4019e6…

MALICIOUS

PDF

89.1 KB Created: 2021-09-13 04:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d108834efb11896f0f4a53595e6e4f93 SHA-1: 6c03e86612e2bb47d842b120482033a870139fa8 SHA-256: e2798ec02a4019e69eb9991467eb77db5078acd5626c5e5d4250bc5dd57c6528
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

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://kozmetikadunakeszi.hu/userfiles/file/4131744743.pdf In PDF document text
    • https://harmony-lazienka.pl/Upload/file/20247822944.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d2d5b2f5ac91673e3d1b6877bc222bcf/69354078670.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/14399794741.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/58563148201.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/16316314501.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2b8349a0ec79a0ebee032ac988ed4fca/vodinawexegejevezere.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/rovanurajele.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/74444051065.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/sodejatatela.pdfIn PDF document text
    • http://schokobrunnen.com/idata/18498048771.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/63390978580.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/xefot.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/5271233813.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/32069637552.pdfIn PDF document text
    • http://asja.ua/userfiles/file/26512595875.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/99709429878.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/soviliwola.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/74819184709.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/68341379482.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/93473093046.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/vimuvowelajazeninegeseve.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/40730671004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=howard+phillips+lovecraft+pdfPDF 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_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 18232 bytes
SHA-256: 46b8f6c327ab316bfed580e4677ffec9814db0a44f5c85aebe650b0a3a781db5
font_01_sfnt_off000125b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B6 10756 bytes
SHA-256: ca321d22e447a7a030f1412aa1dd871e0d51da27a3bb9c084a69aa3dc0ce9246
font_02_sfnt_off00013e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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