Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03108967d5fa95a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 10:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c7d38f60800724d8549c4198d3262ad SHA-1: 78873bf9e4eb19df39ec5a5f72cdf72ff7d12713 SHA-256: f03108967d5fa95ae66767b657dd7b8082b310814be0bf98aea70bc41aa5abfb
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on various domains. While no scripts were extracted, the structure and URL patterns suggest an attempt to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.peritaonline.es/ckfinder/userfiles/files/29599157965.pdf In PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/tuxadixiduse.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/mizufunepinitafudage.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f40deb3f---molinafebowuroj.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/025affa489525875b9874201cec6185c/69091203463.pdfIn PDF document text
    • http://teakdeck.pl/files/file/dagusisiboworonizozezowep.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/divabugopogazile.pdfIn PDF document text
    • https://projetovm.com/uploads/files/51636537083.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/kesudowalosezi.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/27454934323.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/wagomakuwemunadepo.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/57861703633.pdfIn PDF document text
    • https://kratky.eu/files/file/voguwupupuzug.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/47486290286.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/27957592138.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/mofodedigepagugewovifeto.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/wekulerer.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/rutolomamopododagidoviz.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/79350191806.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/xonuxijofitejo.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/nazopat.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/sumaxegitos.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/rewavujemabinok.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/90238042656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=aces+freecell+solitairePDF 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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 10204 bytes
SHA-256: 7b29a30e0b57d34771955996d5a4ac3b301e0d9e3d6110a573afadb70ad1a3ba
font_02_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 17476 bytes
SHA-256: 0f584693ea7140d43af02d5114aa1a6c5af309d8021965d3fdc1198d5bfd70db

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