Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da81a8ad8761f42…

MALICIOUS

PDF

73.9 KB Created: 2021-09-13 13:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9818904adf178b119e6451c194e224af SHA-1: 8a7e559dc37743f80d7536b227e0db524f5c1f9d SHA-256: 5da81a8ad8761f429579d69130599bc81d4d257f366407102ed9ec17f9c6a475
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.psychophonie-tarbes.com/ckfinder/userfiles/files/nibuvifo.pdf In PDF document text
    • https://sambelteri.com/contents/files/15787824479.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///79595038363.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/29271022995.pdfIn PDF document text
    • https://medtek.vn/storage/file/66114022822.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/68755887350.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/74817991148.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/75560310567.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/74970557949.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/42922888975.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-9/20210909150627912385.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/bubewepoxus.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/62636112680.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/41852855499.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19669193143.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/famajunu.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/39044968014.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/zozenoj.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/67938550384.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/73789579660.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/68113933994.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/34748571106.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/39185046026.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/88120838012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=back+to+the+future+full+movie+putlockerPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8F 16872 bytes
SHA-256: 2dce695a0c171537e52db9defac8d4168d18fcf81fd2073618a62f9494741c3e
font_01_sfnt_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 10784 bytes
SHA-256: 603b30e59ec85c81385a795a532f4e1e0d18eb27fab372532b4e12db058a0018
font_02_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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