Malicious PDF — malware analysis report

Static analysis result for SHA-256 4718c10f3de3dd48…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 06:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad9574e2e73843120ced59f549b10256 SHA-1: 13c3dbf438e21f50148485967dcc66266415c232 SHA-256: 4718c10f3de3dd4894c9d927275677b5e3326bb1f0e455e5d81eb36abc7744cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate the PDF functions as a link farm, containing numerous links to potentially malicious or disposable domains, suggesting an attempt to redirect users to phishing sites or download further malware. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://terredellamagnagrecia.com/userfiles/files/gujivubipemoxikelabefeso.pdf In PDF document text
    • http://strahyi.ru/images/file/96968331210.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/45e570d979df441effa2fe01b2f0f2a9/palasuwowulow.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/roradogegab.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/tadozukumosufubud.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/47785668981.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/23279990189.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/patexowavanabiz.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22696251932.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/mexonipupafeva.pdfIn PDF document text
    • http://hotstamping.pl/files/file/giketarabisuvufamapeje.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/57691999118.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/bubekox.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/kumaliwezuruzovidof.pdfIn PDF document text
    • http://kozlovka.mebel18.com/uploads/files/vuwapuxixotaruzimasarodo.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/89424008380.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/86223032475.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/34395979790.pdfIn PDF document text
    • http://benetalent.com/upload/files/38396799970.pdfIn PDF document text
    • https://unaizahic.com/Files/files/xidiravasilalobigi.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/28116158379.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/viwaxidozexamipiriw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=live+streaming+high+and+low+the+worstPDF 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_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 10804 bytes
SHA-256: 59fe9d9ca846ef9510ca10123d750c3715d412741c2ec2de459c3824401b7e0f
font_01_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 17476 bytes
SHA-256: 04d085da067d54fad4904706d9f866681c2add3f73f8cd62176ab7d94af70e7a
font_02_sfnt_off000120bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1