Malicious PDF — malware analysis report

Static analysis result for SHA-256 877e5a518b51d1aa…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 16:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6504a94dbeabdefbe1d9c8ffed27d45c SHA-1: 1e78100ee0a29832e2515378d0c28221a3b406ee SHA-256: 877e5a518b51d1aa41b2eb719b140c7f574626f2fdf25147741a9e61cbbee816
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it's an image-only document with a clickable action, designed to deceive users. Multiple external URIs were found, suggesting it acts as a link farm or redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://nexxosrealty.com/userfiles/files/vijirekikipixiligorig.pdf In PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/14011789301.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/1355356341.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/35364542352.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/70369161964.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/56819248238.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135af8960069---lunen.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/mologor.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/nexepovekubokokiva.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/49470874221.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/wadajizulekerogi.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/85789284327.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/25352164995.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/5992289835.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/lalisunuxobamo.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/vikifo.pdfIn PDF document text
    • http://fructusartis.com/i/File/jododikepak.pdfIn PDF document text
    • https://ebooksweb.net/files/file/72623723674.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/64044042335.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/042c7213105f25f773dbace8965451b2/lezoxakobiwinubipokoso.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/kodisapedimisilamobexuk.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/93704351223.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/96814296401.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/tujimajigeziru.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/gevusudofozidevanoni.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/76624539856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=modern+strike+online+apk+hackPDF 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_off0000b483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 14076 bytes
SHA-256: 2f4a1200f16efd6697da2d4112abc3d2ba958864808e924838bbfde958b78ff4
font_02_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 10696 bytes
SHA-256: 413fdc130c721c3e6efbf8803188d2f912b16549cbf185372df1f231c865072f