Malicious PDF — malware analysis report

Static analysis result for SHA-256 0870da001cfc9f13…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 23:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 804554bcc7b835daaa272b7d9005783d SHA-1: ee74c76783ded9260a137739fe43e2063f9003dc SHA-256: 0870da001cfc9f13dd659914a33e1421049f44aae608194d79740e61b8971d96
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or phish users. The PDF's structure and the presence of external URIs indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=bluetooth+driver+for+android+tab PDF link annotation
    • https://netwindowvn.com/uploads/userfiles/file/kawaketexugebijumepokefi.pdfIn PDF document text
    • https://suncables.co/images/file/nujixedufokegujijefoku.pdfIn PDF document text
    • http://furniture83.com/upload/files/dolizezelixovipap.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/81769437972.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/93728327679.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///sevigipevojulusijavud.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kagoxaguvometuzoka.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/gebotemutipep.pdfIn PDF document text
    • http://houselandia.ru/files/56360607682.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/63020062362.pdfIn PDF document text
    • https://lordoptika.hu/files/files/jezuvido.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/28532316997.pdfIn PDF document text
    • https://funke.be/data/file/29234536770.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/movaxav.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/24482172068.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/zuvavisegutut.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/magewu.pdfIn PDF document text
    • https://qkon.ca/images/file/99501383550.pdfIn PDF document text
    • https://forssh.com/userfiles/file/gefilo.pdfIn PDF document text
    • http://grafitym.kz/files/file/mokegu.pdfIn PDF document text
    • http://toroisg.com/public/images/files/10602755754.pdfIn PDF document text
    • http://thucphamtruongthanh.com/img/files/96133057285.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/61660928933.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb65594776---48956120384.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/59486361828.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_off0000b274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 14544 bytes
SHA-256: b7732641a66896ac0fb790baf71c24e392051957528e35a00b1bd48fb25c0b22
font_02_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 10640 bytes
SHA-256: c171916085a4efe2707637eea4b8dbec97a68ef81fb694d20146576d4ffeb852