Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e0ea5961f2edb7…

MALICIOUS

PDF

83.9 KB Created: 2021-10-05 21:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: f4de355998c29cd88b338bcbeb53db9c SHA-1: 01244270215675caab31b2ce8c8567d7f8ccea44 SHA-256: b1e0ea5961f2edb7e508f6d3fef9d4d2df237e0215d5f3c16ca53f17b3b17aac
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some of which are hosted on disposable domains. The presence of embedded URLs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/uplcv?utm_term=hypothermia+after+anesthesia PDF link annotation
    • https://korankertas.com/contents/files/gewotutubujazesobofigo.pdfIn PDF document text
    • http://coachhouse.info/assets/file/11882414768.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/juzoxekebis.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/gikaniku.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/78780705719.pdfIn PDF document text
    • http://centrons.com/uploaded/file/94088338261331b219dc28.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149a1175e7c5---2430825018.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/95197781270.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/niwenubitaso.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/53868839852.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/86344401826.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/27558838757.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/jaleva.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/jupimafabuledupumij.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/8671269385.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/virunitu.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/31141695524.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/1947743238.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210913_223044.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161444e44f29d9---16930298068.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/51104703740.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021093020222392.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/befesewiwedofegutav.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_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 18872 bytes
SHA-256: c2e8af3fed3ffe02700b7048a75feee277e5528efeaebdf53c46e3a525207652
font_01_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 10684 bytes
SHA-256: 6b4a88b946a99c5ada563b5136b13f282512a6d00a23d459a4758e731f7b8891