Malicious PDF — malware analysis report

Static analysis result for SHA-256 678a2b8ed067fe96…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 16:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1807a7e8bf0928a096b358e04d96cb1 SHA-1: 5d0a1ddd42eadaa56775e65fae48675315376938 SHA-256: 678a2b8ed067fe966756d2824662c5d3925d0e65578fff9e6786717fd2c73e87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristic analysis indicates these URLs are used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=free+website+to+watch+boxing+fights PDF link annotation
    • https://mbzl-pro.xyz/web/img/podborky/files/43850692126.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/51050237828.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/56128364692.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/54010551216.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/63641642870.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/jaxuzolaxa.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/nelubelutubeda.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/60540728592.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/25908406489.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/95887508749.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/ripepulukogemutujisemedi.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/dajevezaxipuwobebupiri.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/73260052393.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/f6e922c914b90aa54d00c75fb214108e.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/votimigo.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/nakogezugo.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/bafumagotol.pdfIn PDF document text
    • https://bliznacite.com/files/pofid.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613343ec1ee52---71971286907.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/lopofowozusu.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/nafomudojivitigiromo.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/luwebosodoreta.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/9761863661.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/93557606609.pdfIn PDF document text
    • http://newcityhk.com/userfiles/dixapuxamose.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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 16748 bytes
SHA-256: d07be2db5a24e19bb79ee385d1632a5f204760a833495e25d0313400c8a5d429
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10876 bytes
SHA-256: 7a5c69ad9d3651a560055826ecac18c02a072cc5eed8ab8261ede61d2331f35e
font_02_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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