Malicious PDF — malware analysis report

Static analysis result for SHA-256 385cf1c1d87c3452…

MALICIOUS

PDF

76.2 KB Created: 2021-10-08 18:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 25bf649d50bdb82aeaf2a55b9f3acbc2 SHA-1: 1a090e25979f091b99e6cb429f239e77c59ab328 SHA-256: 385cf1c1d87c345285a54fbd5adb4d02a4bfbf5380c5984dafe8bbce6bafdddb
134 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 potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://em-mould.com/ckfinder/userfiles/files/5146319183.pdf In PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/pepebogirakedifuboge.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/p6q5ruo8fstjvbnrlrblkbhrmr/melijaxuwefipomurerigaxel.pdfIn PDF document text
    • http://bndweb.nl/upload/files/susejoka.pdfIn PDF document text
    • http://mcutech.net/files/towolifonapomeri.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/13007901133.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/73591118869.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/70222338720.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/pivudibiramul.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/gonubusu.pdfIn PDF document text
    • http://delve-cr.com/uploads/kapogumowugojemugoto.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/56026933440.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/85618341688.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f28c6dc09---mudeketeruxa.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/39340288411.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/janevaxife.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021100115452173499.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/96120661799.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/37246581025.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/6369854802.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/50774122025.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/tanujakivogovavukifemox.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/sezarejado.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/18031461048.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/pabegajanuragexo.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/zobap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+are+2+ways+in+which+mixtures+differ+from+compoundsPDF 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_off0000c32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32B 11356 bytes
SHA-256: 8301e76176fac08d8fa29e54ad1b18ea5303185c2e64fc10343c454ea0b40920
font_01_sfnt_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 17404 bytes
SHA-256: f379a601ef14e5639c702682a2888ced956318e6beee16176621d3748d962601