Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d46cb17e5c802c4…

MALICIOUS

PDF

81.8 KB Created: 2021-10-06 19:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: adbfc60e26d6c721d22f2a0ae6292fdb SHA-1: ce55b181245455279ff8f08e565c9ddbda289342 SHA-256: 1d46cb17e5c802c41b5ec132f6be8417c7e7a37a56a696c544bf2172115f22aa
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to unknown domains and are structured as file downloads, suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely exploiting PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://abogadosaguilar.com/ckfinder/userfiles/files/37808321811.pdf In PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161418042d3ae2---lepogalagalujaxaw.pdfIn PDF document text
    • http://nemochem.cn/upload/files/11692366369.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/saponupamamo.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/14539447464.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/24800363316.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/gizidozaxaxun.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/navatoxaxek.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/84609873795.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/50906217292.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o3070eju7edkr0dmaetvtp74f6/lepirikutor.pdfIn PDF document text
    • http://ndt-ultratech.com/files/maxevodefudamuxofelezenib.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4f8ae5269a750b3ef220f1e1b7297004/7313129283.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/72158112932.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/239343567.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/58469794505.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/72388891396.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/43890180070.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202110050823583677.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/98601919106.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/11679383452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=catherine+bell+current+picturePDF 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_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 18864 bytes
SHA-256: 24eebe5c2b74f34751eab6b3d6e206bef1722d5dfc41eff0b3475676b3eb6a22
font_01_sfnt_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 10452 bytes
SHA-256: 2ec67ed2d624009e9d300db5a5df514e38720f6f9727c13f728381ad402f8b21