Malicious PDF — malware analysis report

Static analysis result for SHA-256 be84645ab64da2c5…

MALICIOUS

PDF

74.6 KB Created: 2021-10-08 12:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 220ad5110bb0e221984a1e536bb4c532 SHA-1: 6ba9d2e9108a6b2f934ce762a7476e5e5ab9f9a5 SHA-256: be84645ab64da2c5273faa191271635adc5a6f3de310f581a3f17f80c96e241c
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicating a potential for malicious execution. The document also includes numerous external URIs, with one heuristic identifying it as a link farm on disposable hosting. While the document body is heavily obfuscated, the presence of JavaScript and the link farm behavior suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 https://www.willmarshelter.com/ckfinder/userfiles/files/fomupiratepirog.pdf In PDF document text
    • http://qazaqbanki.kz/data/content/files/87551913078.pdfIn PDF document text
    • http://jfe.hk/userfiles/gegotuwonumu.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/76011331339.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/jatenalafevanopokuza.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/31788820353.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/zelemowafanisosiruj.pdfIn PDF document text
    • https://dm288.com/slicice/file/31008301112.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/vanozozabivazoguwanalagow.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/xisupokewo.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/64357913520.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/3094262146.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/dofogijomolutagoniw.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/wolefi.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/sewad.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/zizububatukureledub.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/56912335357.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/kaban.pdfIn PDF document text
    • https://dm288.com/slicice/file/4305506910.pdfIn PDF document text
    • http://sin-hua.org/userfiles/dowiwelilabu.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/21738809189.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/92159850512.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/varutusajamemapiseserezuw.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/45771872583.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/71511341454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=501+vocabulary+questionsPDF 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_off0000bdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 11000 bytes
SHA-256: 64388045d6a6b3b5c6f6f995d57185605f587f6f5027457bdf34cbdc8380ca96
font_02_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 17312 bytes
SHA-256: bc6ce08700e34650a8404c62873610c77687f6aacb4ded21e1fe2a556f87fad2