Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb84703cfbbb33c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 12:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c383f5fd62422ce8b15313c9da0cb0f2 SHA-1: 8a452eab3934bf4aa9147037eccbdf9faae60b4e SHA-256: fdb84703cfbbb33cbf9d8f24fd5692c779e3c6eba9862e21b8a62f91714ea555
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the true destination. The presence of a 'download button' heuristic further suggests a lure to download a payload. The primary attack pattern involves tricking the user into downloading a malicious file via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://3e-machinery.ru/app/webroot/filesfiles/bigedisikogekumugafibera.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/69840285902.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137432be99ce---54455264322.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/53320263113.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/totedowidizonemuj.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/muxisofakajinoxu.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/lexovepatadosoti.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/52689626785.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/42976804500.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/pisafi.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/pabexazerigexetumejiseto.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/defuvaduweju.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/89955964122.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/66735698235.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/12253217360.pdfIn PDF document text
    • https://empresa-venta.hr/files/11343951517.pdfIn PDF document text
    • https://foulardfotografando.it/file/31933126897.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/7097445569.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/51098976416.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/80916520551.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/lomedowabusotiwibadidim.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/20659178067.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/73891788081.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/9258538936.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/239384ffa874cfce1712c8094aed125f/lutiwur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=convert+url+page+to+pdfPDF 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_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 18188 bytes
SHA-256: 54eb8e7e9a808b9f1423fec26aa8f98f436c1d2ed2830f9955cb1e28db577dbd
font_01_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8F 10612 bytes
SHA-256: 4d30eec04827a9ff696fea8265766a7dfa59f5f0eb98b885c07307f29caca277