Malicious PDF — malware analysis report

Static analysis result for SHA-256 789b475b77c1e4d1…

MALICIOUS

PDF

85.7 KB Created: 2021-09-15 11:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c64649e73705d0049c23f686ade21d33 SHA-1: 36eeaea6b78ea8dd0c1e4e12500bac48635faa19 SHA-256: 789b475b77c1e4d14b54c81008a0bed548c993c5ed3cd61614b5a5c8858be352
134 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=install+popcorn+time+ios PDF link annotation
    • https://newshieldinsurance.com/demo/gsa/final/images/file/parapuvofuwa.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/vabipowidizak.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/torakamifojodubip.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/zaxaxotosa.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/dofagatuf.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/kezas.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/babutesaxodisarelizumu.pdfIn PDF document text
    • http://debten.net/UserFiles/File/piwofog.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/lokadoporovajolaseberu.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/60216451246.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904054850.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/34949721364.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/16f2717d1a1aa1149e1577a5c57e6c59/zawipaworalob.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f694aa07ac---33166120016.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/53907095315.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/kefijobuvul.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/11055941734.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/lexebozosinuvasamuxaw.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/76201593836.pdfIn PDF document text
    • https://bnovum.hu/downloads/98301084734.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/30220108661.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/fowixulopulidivavakekas.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/95769174244.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/38321766585.pdfIn PDF document text
    • 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_off0000e879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 10484 bytes
SHA-256: 2696068c3ad0674c6b3002805f4410dce78939310b6048d9ab167d01c8ed6164
font_01_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001185c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 19040 bytes
SHA-256: 302f47788b4cdf78d3fd9cadf538baf508c8cff405f4b7a32eb3fe1136dbfb45