Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77c13a87685d7f4…

MALICIOUS

PDF

97.5 KB Created: 2021-09-10 12:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d956619d87fc53397f215d5c23b5e3b SHA-1: 6212f98f66fdf1eddacc345d40d14be24c7706d6 SHA-256: d77c13a87685d7f450b99a623de58de35a86862c602d3d18216a3254ff0476fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on seemingly unrelated domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://bruceautoservice.com/files/file/49541481000.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/42073466761.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311837e58e6---74298016371.pdfIn PDF document text
    • http://trivio.it/userfiles/files/laloperekawibabeb.pdfIn PDF document text
    • https://profm.hu/files/file/wovirozurixe.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/vutijaxaxi.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/43050357510.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/jidatidupi.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/63744313034.pdfIn PDF document text
    • http://premo.at/userfiles/file/dogugonifijavoda.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/8783780398.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/mopubapowinaterugu.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/gelugizosak.pdfIn PDF document text
    • http://emeat.ru/var/files/15719571861.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16137d13af2773---sukonuju.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/12036166425.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/xuwikasodisimakisenad.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/10716142546.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/fetufizazutunak.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/57080844807.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/70407334913.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f09e0adfdbbc8a573f0ec8cb7b188c7/10132934044.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/43827606561.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/15939729359.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/35546676479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=kumkum+bhagya+episode+mx+playerPDF 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_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 20072 bytes
SHA-256: a6b41e987496232118cdd59140eb7d775506b691856c5dbd483baa605d090ab4
font_01_sfnt_off000144db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF2 11176 bytes
SHA-256: c3d2c6c8fb813e5d1e8e6e3b5edcaa589f1423f925932c00288062332a5ed4e8