Malicious PDF — malware analysis report

Static analysis result for SHA-256 e738da2ab6b2e32e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 22:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2f7853e9abe8d6a265ea0bafcfb20b0f SHA-1: 450600ed513c5f5683ec07fb84020a2991ab3b9a SHA-256: e738da2ab6b2e32ee1e0d7b6fcdd06193afbec933171f6c122e773596b10d7f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious content or phish users. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4f47040beca8ed1ef11bc42082e4011f/bikatabigof.pdf In PDF document text
    • http://egitara.com/upfiles/files/45412290210.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/gemukefevavobusawinepu.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/wuwonivob.pdfIn PDF document text
    • https://citronel.com/userfiles/files/jetixaj.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/debugepexozapelago.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/92002239737.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/bizudofejofudonalad.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/luwagadewoxiraz.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/19236461774.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/togubemufisaji.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378c6be8e7b---nejurov.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/3330242137.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/99903608306.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/vurosoxet.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/93197748673.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/25691475528.pdfIn PDF document text
    • http://intertravel.hu/_user/file/pinamiridefilokaguxesojom.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405370dea0e---somokokekusapofidurij.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/mozolakabesone.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/nizobefefoxovibuge.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/27435620568.pdfIn PDF document text
    • https://avela.md/userfiles/file/20774005175.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/90335529532.pdfIn PDF document text
    • http://only-svet.ru/upload/files/pozibiminabetikivemafivil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mini+militia+simple+hackPDF 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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 10504 bytes
SHA-256: edccc7dabe9ddd031db5ab29c243a5dddb22d452e31d7f726bd70cc5b5298cd0
font_02_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 17124 bytes
SHA-256: c8ec4bbddb7af437b49fb69e6134ee5fc078f221a6ecd4de10b7c3ee6a5acbd5