Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5093e8f681ed72…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 04:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b261ccfb0046a87dd5afdca381bc00d SHA-1: b7776fb52385ce445d20b5caccf8651e53a3834c SHA-256: 0b5093e8f681ed7297f71af44ffb587c3dcafb157cade6ed14d03ee53e3793bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://stockbauer.hu/uploads/file/20228632273.pdf In PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/42440917077.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///27981064029.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/muwatezodibipufixakoxer.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/8534905561.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc71fc407c---70188042429.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/76617394231.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/nujugokegokuxoxizurefiwij.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/kavigupejajedetakiz.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/nenaforobobuk.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/zalenarixizumudesevo.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/87143010489.pdfIn PDF document text
    • https://theipbuzz.com/images/file/42708166453.pdfIn PDF document text
    • http://sergeybazarov.ru/file/jisodibulojafi.pdfIn PDF document text
    • http://ailizia.com/userfiles/59610982477.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/30340197511.pdfIn PDF document text
    • http://www.praasia.com/file/files/fuzunugevusolazo.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/33896541014.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/59460788238.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/93568085428.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/71166107782.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/91234029286.pdfIn PDF document text
    • http://baoveantam.info/upload/files/pobemubasukopelipuloles.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/1988986585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mov+videos+androidPDF 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_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 18776 bytes
SHA-256: 3eb5a27bef6cf5f38ec2b815941cb3b14cbe57b093a16190fece4b644c4dbef6
font_01_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 10156 bytes
SHA-256: eed99ac775f273cf931544a2f8300be525c7cde206adb04329c185d7da28083c

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