Malicious PDF — malware analysis report

Static analysis result for SHA-256 843352db1c3eb43e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 14:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddc2f4298d7c98a67b7de51981b830dc SHA-1: e1091ff6693250e03b1a49c04cddbc06546b536a SHA-256: 843352db1c3eb43e06c4f9264b3f3d8d7134131820caeb73306f948c1c0269d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document contains numerous links to potentially disposable hosting, likely to obscure the true malicious destination. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://dalnoboy.org/data/filestorage/upload/files/xumezirizivot.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/f8345e8df993bd11f91a1e26e486a3dc/velogekoduraro.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210901_111559.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/79296269871.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/wagoxeluw.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/97647034541.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/78329783318.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/tobufodagugategepanarukig.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/mulig.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/lapiwosapidiravidobef.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/58948624418.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/72006136708.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/72089850237.pdfIn PDF document text
    • https://agatanorek.com/files/file/54491987817.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/88129787209.pdfIn PDF document text
    • http://rem-proekt.com/f/file/7676986239.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/gimebeferumofuxul.pdfIn PDF document text
    • https://aitalk.vn/upload/files/15835410348.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/71343207137.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/18066227430.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/73639254772.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/gazudu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161395f86303a6---52500181425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=3d+prado+parking+mod+apkPDF 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_off0000c02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 10456 bytes
SHA-256: 793376f44469008de25d3a59c45afa2411714738274e0e3148049e521d389a54
font_02_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 16860 bytes
SHA-256: 513847e92eb90bb0babf063c44bf5a44a8da20e71966bf4664f355c2bbd87a78

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