Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da366803f9affba…

MALICIOUS

PDF

77.8 KB Created: 2021-09-11 15:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8435bc495b2e27603bf22ae1f2fee4dc SHA-1: 427eb4b12c2d17445da6bef489ba7990938c6984 SHA-256: 9da366803f9affba19bf221b3662fc2d286da3a5a5774c9c3044ae715c5002f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thietbikhachsanvinhhung1.com/upload/files/23186006459.pdf In PDF document text
    • http://ozgu-yapi.com/firma/files/80523031354.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/vetiketujasekot.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/30248308049.pdfIn PDF document text
    • https://path.mn/userfiles/files/49382841035.pdfIn PDF document text
    • http://eichler-kammerer.de/93307740196.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/wumafonafejojuguk.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/60634289421.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/56541382746.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/50743450819.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/72197641297.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/mebowetope.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/48937486519.pdfIn PDF document text
    • https://network-italia.it/file/94433283612.pdfIn PDF document text
    • https://argumentua.com/i/file/81059049352.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/78093681212.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/kafejizomadadaw.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/98094554594.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/ruzinokuxasavivamefa.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136028db69d8---83336106140.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210902124448649.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gikolaripifonirusogitew.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161305e2421f4b---29440745871.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210904235241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gem+td+androidPDF 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_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 18120 bytes
SHA-256: c6debb7ebfc2dea0886a6d733a0c97940ab2f2d9ac01231cf73fa4c00fedc060
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 10236 bytes
SHA-256: 53f290683e3aff93857e2de342220cfeeba13961be40931a96b59290addf1156

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