Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d3b284752512f1…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 20:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 26ab91b564bded8b17dab2a01d35e398 SHA-1: 0ba6879e0150ca1f899539d64bc08c2ef1006833 SHA-256: 34d3b284752512f14f1bf82d63572d670397d27d52506ae0bbf144e4bf2cd72a
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gruppocreta.com/userfiles/files/128012437.pdf In PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/68990536723.pdfIn PDF document text
    • https://icbacademy.com/upload/files/mokibukanef.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/xamututul.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/dinuzemagedom.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/77238894207.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/32432130816.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/64762169954.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307a798197e---xirekojoxibugefovujuxexel.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/34287951580.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/23052108756.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/gekobemofobemebisunisiziz.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/sazaxaxufo.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/kugununiwabajajeli.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/90817223539.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/9576945384.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/nimixevumafinutapusug.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/reloputebonugejaweketuzeg.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/rodorimuduzoluvulujit.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/8326547610.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/nekunetisosezotomigofoma.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/mulofafirew.pdfIn PDF document text
    • http://artepcb.com/upload/files/pomidanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manually+add+page+numbers+in+word+2013PDF 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_off0000d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 11536 bytes
SHA-256: fbff0acc5d5f2f1537d5efe08fc59c643ab188db85fb892ce2028b16cf603c0a
font_01_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 16804 bytes
SHA-256: 75312cd0c973d27bd6922ac56beac9c8b3a156d1eeac1816126324f2aaa17edf
font_02_sfnt_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1