Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aac7015d51df977…

MALICIOUS

PDF

74.2 KB Created: 2021-11-11 16:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f1378c9d203436e7e8897f7cce128494 SHA-1: 5c6e4b2d5e0d0ef5d0b18a2ec1d3bbda917f8e9e SHA-256: 5aac7015d51df9771b561efa089599d824f1c20de7ee2818574586029ef0a1ee
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, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16172ac151df93---8621114692.pdf In PDF document text
    • https://ecoolteh.eu/galeria/file/21047963962.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/62952549607.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/ranubozaxavemigupapug.pdfIn PDF document text
    • http://parentini.it/userfiles/files/87393078827.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/43731795826.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/foganimag.pdfIn PDF document text
    • http://getvisa.ru/images/File/79787897847.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/sojexujulavobivipalot.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/26787642646.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/rumili.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/supofuvipijeloven.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/jexopirijijejunogalubeko.pdfIn PDF document text
    • https://kiptep.ru/file/konises.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20211104_FE2DE531DFC27D71.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/75068316651.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1635034511tazawogugezakoru.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/muzubidimitekituruwos.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/67915251031.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20211027010012370514.pdfIn PDF document text
    • http://archive-2015.humandoc.pl/attachments/file/37221705140.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/tidedafulexugijeneru.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/26126677291.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/93254313326.pdfIn PDF document text
    • http://dejede.com/userfiles/file/dapusafaram.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=air+quality+indexPDF 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_off0000be80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE80 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 10396 bytes
SHA-256: 4b51c0fc8def8de17927c2410e6eeb223b01229a3cbf7beb1054948dab0cc6d7
font_02_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 17788 bytes
SHA-256: 712bec2e14506c8f4d2746bc4d032767c5c239eb88082260fe812c10aa004f37