Malicious PDF — malware analysis report

Static analysis result for SHA-256 90457a7bb8973c01…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 22:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2db919771874b365073a9c7a219b4cb6 SHA-1: cb1782b3d5a314ebe1f64ac752253e45c3ea53ed SHA-256: 90457a7bb8973c01d105886e5e325c17e0fccde11d7c1b3e2540201aa79a41a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://collegium-connect.nl/ckupload/files/vibugemulukonimad.pdf In PDF document text
    • http://monthclean.com/uploads/files/202109110001006111.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dajujakadepej.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/3351587931.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/55552043408.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/tizufutowelerefuwaje.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/13676024534.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/73909314894.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/watikisifasutapaxugexivum.pdfIn PDF document text
    • https://kaimano.it/file/zexulasozawadino.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/ruwos.pdfIn PDF document text
    • http://esen.life/userfiles/file/82752820624.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jetegovajo.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/dijokijoxer.pdfIn PDF document text
    • https://marlin-shop.ru/ckfinder/userfiles/files/fabeze.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686db057ef---masujag.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0553560001631278899.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210904095308.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/57085575036.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/76127861788.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/37271024633.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/29697876046.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/zuwupuvewuluzirobopulurof.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/16322018869.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/xigosoguwedof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ff+6+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_off0000c0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D1 19848 bytes
SHA-256: b7240db1427d1de21199edae83df6ca8029930cba04451e5faf6254c62c6d6b2
font_01_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 9728 bytes
SHA-256: a0922f8589345fc4ebc664febf3596acf5ffa96f0395dab82e27589e0573333d