Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1c19c7a5f8f4cd…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 19:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef322f974d05acd565f2498337930981 SHA-1: e18e4df71caf71997fc035d6eee2bae592efafe4 SHA-256: 0b1c19c7a5f8f4cd38a462e01de617795a96f72329385db2c5a9445d720e5a31
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tsrmmessina.it/userfiles/files/zatifavotefobuve.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed57571cf0---89735410184.pdfIn PDF document text
    • http://princeverma.in/uploads/files/vajedufituzumasawu.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/22088781552.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/35431281665.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/xozobedenululedidixa.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ce962da18aa26f2846410b464af5fa36/92107077545.pdfIn PDF document text
    • https://anaksemut.com/contents/files/80429607157.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210913031458.pdfIn PDF document text
    • http://biosite.ru/images/news/file/fuxuvesiseko.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/78686230765.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/rafodexirakusuwomojipilir.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/33841359422.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219323583.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/89964156012.pdfIn PDF document text
    • http://it-hair.com/userfiles/7288993280.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/22926575727.pdfIn PDF document text
    • http://www.siposferenc.hu/html/71042384315.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/64778371665.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/laroduminijakifaxukapekex.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/zurafu.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/39429278985.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/35644805481.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/86349673878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mm2+knife+worth+listPDF 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_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 17132 bytes
SHA-256: 45cd1f94bfd96b3ce395c42f2265cee8bf231e51409705141becd7c361cbca06
font_01_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 10608 bytes
SHA-256: 9826c493d9bdbbd3c09d688e70e9ffd5be613f098176514033b8e1981df2f130

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