Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5993883c7b7f30…

MALICIOUS

PDF

96.1 KB Created: 2021-09-12 00:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57e99853176f5e673ad34f79225f357d SHA-1: f64dd61c19dba33a512d0dfe933f600f503179d7 SHA-256: ef5993883c7b7f30a855b00018bc443002d0727961b50db7a481596ffbce0826
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to leverage external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 5

  • 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.
  • 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://novosib-sport.ru/ckfinder/userfiles/files/13696519261.pdf In PDF document text
    • http://adhdesign.de/userContent/files/20210907215826-tukutij.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/kuwub.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/80136994858.pdfIn PDF document text
    • http://anninh247.info/upload/files/bopobeviz.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/26575614462.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/lokoviroboxuwovunuxem.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109110149245540.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/2418955442.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021912459556743.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/kinikilajubi.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/funozujakumu.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/janivikizusujona.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/jisojefo.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/76271331823.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/41903193410.pdfIn PDF document text
    • https://eguiders.com/uploads/97372469199.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392930a4ad4---99974494153.pdfIn PDF document text
    • http://chinazzjx.com/d/files/jusukefevowab.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/kuvesug.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/korudadifevul.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/41263970856.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/73668171648.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/bogus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=game+of+thrones+season+6+putlockerPDF 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_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 11052 bytes
SHA-256: dd17de49513b9ab95bcd17a973951fa92458abeaf78e102d55955772bda170af
font_01_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 18944 bytes
SHA-256: 79d42ed86c944b6f351491023db7220983bcc93db2843081c05951d076ad4c0e
font_02_sfnt_off00015b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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