Malicious PDF — malware analysis report

Static analysis result for SHA-256 488f5c95803602f5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 01:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7327744f4e7f7d365331444978950aa1 SHA-1: bc6d0e9731867608213e1a1afc263bdcee855b27 SHA-256: 488f5c95803602f5a45210958b7798fe38eeaf4c96c56dd140a3339ae545b042
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to host malicious files. The ML classifier strongly suggests malicious intent, likely to trick users into downloading a second-stage payload via the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://commandhousecreations.com/uploads/files/milufujomupi.pdf In PDF document text
    • http://195exim.com/datas/files/besivuxofasoza.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/lewesomamepikabod.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/lilewagavupelul.pdfIn PDF document text
    • https://securitydm.net/slicice/file/92488954108.pdfIn PDF document text
    • http://szcftz.com/upload/10600216993.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7cd5f219---41753589165.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210903161928.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/19361019545.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/5596757941.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/41831325789.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210916_055126.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/tizuripipitup.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/dowegopipewibovazagugir.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/xugubotebamu.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/80946553525.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/zaguju.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/xalufuginisumovomarogoze.pdfIn PDF document text
    • https://oferta.lt/i/File/12548240538.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/wasumedarurinonutoxapude.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/foketojirewozeb.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/keguvefaxiti.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/gojutomimifixirij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hiragana+katakana+workbook+pdfPDF 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_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 18804 bytes
SHA-256: 63690ddcc30a77d1d8c8c4715f35cac318b32ff706f0124ab767c2315318ca89
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10636 bytes
SHA-256: c861dd3e0a5083ae28fe41d8f2ab1ec05c5e2070e1300ff1571a36678b616db3
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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