Malicious PDF — malware analysis report

Static analysis result for SHA-256 11193c691dab24dd…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 08:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 072fa0fddc5a907b3368b5be9306e27c SHA-1: c9f1c3008edfee9cbe6a0bfea7ae64de755f9d48 SHA-256: 11193c691dab24dd4f79d46ad85663027e3d71d583a32a531136745e0723cb2f
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on potentially disposable domains, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pistant.ru/uplcv?utm_term=hello+android+program PDF link annotation
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/devof.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/26785beec340eb1d606c43d32b0462f7/rosimafi.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/64635839233.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/bijavesanor.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/sivutetakogesejusulus.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/polizujuxazetimogon.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/66983689793.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/74997203008.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/569a04f59813e547b8e42dc1f34beb4f/60506120293.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210917_052713_8819.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/batanabefujinilosa.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/41212654326.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/48824107580.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/91988721187.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/kidokazezejetok.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/9495608512.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109121251518922.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/39035264311.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/69257231799.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210901122928.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/23158195660.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/29982027165.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/gofezitekakubumifosek.pdfIn PDF document text
    • 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_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 10460 bytes
SHA-256: a17d021e1f697ccf028b1439fe6e97ac721b04aa1b2bef9c183964d511e4fd8d
font_01_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BE 18944 bytes
SHA-256: 9a80cbec4d73aaacff38e3042058a41c081f8bfc692bbf53494e9dbc29939c51