Malicious PDF — malware analysis report

Static analysis result for SHA-256 19188631d05cf8f5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-13 19:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7559bd3ef4ea22a56906c60137111ead SHA-1: 077bff1484005a18bcc58e038afe814953ea3f24 SHA-256: 19188631d05cf8f53436b5330a320ca6f57d3bc533ad7a67af23f05acc42c6ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://year-c.com/upload_fck/file/2021-9-5/20210905053433275018.pdf In PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/jubirejakixer.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/22909566120.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/54628226927.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/479076640.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/lukuganisafuwij.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/pibad.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/7337389691.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/77216068552.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/28512863999.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/wesabuzojigafobediz.pdfIn PDF document text
    • http://npas.ru/pic/file/jakadevu.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/88157419910.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/39455484311.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/73938113733.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/59151143571.pdfIn PDF document text
    • http://wami.cc/data/files/jolisemigatozibiborinu.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/31404833045.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/wokupejofarotozepefer.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/49669557830.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/tudovovixejitifesemob.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/xuligopipigemeritajawuje.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/73072721180.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/64808143474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mod+apk+bloons+td+6PDF 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_off0000b8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C3 10456 bytes
SHA-256: d4324d78bd59fba3a25a5d3988cdd8aba312124acd97e3ffdc6460d98496b50f
font_01_sfnt_off0000d066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD066 19448 bytes
SHA-256: 448c27514c55aeca399d5d7df172e39e3f5b7ca21516bf3a54102bdf491ab23a
font_02_sfnt_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc