Malicious PDF — malware analysis report

Static analysis result for SHA-256 c093aeecd22c14bf…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 16:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 994e26fd5803d0e8d0f8a42f5fd7668f SHA-1: ea2f46ab4d7efef4b02903bca9a0e6f62b225e51 SHA-256: c093aeecd22c14bf2ca350f96c5ee4284acc4cbd7252a01e3f331d75b73e43e4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm by heuristics. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=where+is+my+sd+card+located PDF link annotation
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210909015956.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/90086565992.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/45037320824.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614689c98d068---76581483752.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/dedidudugatonibekeruruwul.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/85898322685.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/60069795117.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/38141028682.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/gowagifixog.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/77915691104.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/93225015143.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/mikofopasonodewaruf.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/70752479108.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/90299747991.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135b60e28a92---49722836864.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/bomejewoxomarug.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/97066193743.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/wabopuzolotokulitatofuwaf.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/tiwarurata.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/34237515451.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/getedozexutexub.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/75914956262.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/goxofazo.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/xirizefosuxegus.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/kogulowuwifadutomize.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_off0000bd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 17496 bytes
SHA-256: a5d9dd0f0c728d34de1b772795c333f042d5663c111323a6f183698fb1fda5ea
font_02_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 10640 bytes
SHA-256: 5bfa73b18b960be5a9ba5aa5cd57426b4efca1130b336eb8c7520209e8e22e1a