Malicious PDF — malware analysis report

Static analysis result for SHA-256 515336aab8dc7a9f…

MALICIOUS

PDF

85.3 KB Created: 2021-10-05 02:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 901541199b6ef515e8221477a4a5dbfa SHA-1: 12ded4fe719f81628180a807db06e0abdac7b62a SHA-256: 515336aab8dc7a9f052ef37c143e4b31f81be63198d8dd2fbe2faaee53268211
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613826d88961d---52756605017.pdf In PDF document text
    • https://learningsolution.ca/userfiles/files/rorenenupotuxefowef.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/66175180504.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/mefadudefilipagizebijaf.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/mafasofokunakaxetobo.pdfIn PDF document text
    • http://climtech.com/files/files/fizizuxukin.pdfIn PDF document text
    • http://orthodoxnews.us/file/66615295860.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/juzuma.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/57717707182.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/4053482868.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/zuzetevanujata.pdfIn PDF document text
    • http://northcity.rs/slike/files/67490621767.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/rofesabujuginovojuwow.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/85168278582.pdfIn PDF document text
    • http://robbes.nl/media/files/64270216794.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/55704515180.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/kolagidulo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afcb849270---84460953408.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/19269333287.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/59652267507.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/lopokevibikisexomox.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/92982644688.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/36107823988.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/jirimezogoju.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/melowubetopome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=breast+and+bottle+feedingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 10724 bytes
SHA-256: 9316ea0c0d6328aea6eb61bf2fb66f154148d6e25d3e2aeadbfc87cd44ad41e6
font_01_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 17848 bytes
SHA-256: 95f1a731d24e742943f6a406ad5222636046273123799ea1ff13ddbec621521d
font_02_sfnt_off0001260e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1B 1804 bytes
SHA-256: 40ce09ec31e5c9a3fb5e0f5b15172400635f0acd87b1afeadc5119a6a0df2b9c