Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb720e9b042b7f6f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 05:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8337263cc6e279d6130a6dcae58caf61 SHA-1: 306e4b36d6a18c33b7d7c9c9f3815ad3def566af SHA-256: eb720e9b042b7f6fd472ced9f315caa4a5bbe1272037229ece58c170a9b5b5c5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the malformed stream length and the nature of the embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.prshots.com/ckfinder/userfiles/files/80462576691.pdf In PDF document text
    • http://kstarsmall.net/userfiles/file///muwelagokemifelil.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/99535174492.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/zibolume.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/56815945940.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/558154018.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/fubasozosup.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161408b19d9474---61162374275.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1bd2f135f---fekumunigefalebesef.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/lorebuwomes.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/wibenezomo.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/peruzob.pdfIn PDF document text
    • https://moolans.com/uploads/files/73520097069.pdfIn PDF document text
    • http://myesen.life/userfiles/file/45277161603.pdfIn PDF document text
    • http://tercovci.cz/files/file/44535204750.pdfIn PDF document text
    • https://databaze-zdarma.cz/userfiles/files/62180285900.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/wegurovajusine.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/52754555409.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/82800496340.pdfIn PDF document text
    • http://metzlerranch.com/userimages/80473660123.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/57037361537.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/kamigepupirekikijomidiz.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/wamoj.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/lolawom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cyberpunk+2077+android+launcherPDF 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_off0000beb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB6 11112 bytes
SHA-256: d13a3e2ab2dc9c03951e1c03fc20256de232ab28bfc7d987d5c1514186511a70
font_01_sfnt_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 17672 bytes
SHA-256: 9db4e286521f3cc7e04c501056c0f15db7a5fcb0c87f84f5816208c4ae9ba7ce