Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de8e52e3a6e1fa7…

MALICIOUS

PDF

69.3 KB Created: 2021-09-15 18:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad6568c7b90f8fd932a856754e8eb10e SHA-1: 2527e1649879ed9d34dc723f003b5c9272df4e78 SHA-256: 6de8e52e3a6e1fa7b8348747ba2d4bdf636e1df9d0229b42544ed39aa99249eb
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://smidgel.ru/uplcv?utm_term=the+hangover+123movies PDF link annotation
    • https://www.nbc.com.vn/ckfinder/userfiles/files/pefoli.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/daxotor.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/daxemakimi.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/woriralegiwevarogoseweme.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/wisexagabuwujogedojoponi.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/batuni.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/wulasisidemabowubineraxu.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/nixidopod.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/68755887350.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/42004258231.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/55668791095.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/lanatafuloxaleg.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/werusexuruvaf.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/guzafolunuzowedapew.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/sizesejax.pdfIn PDF document text
    • http://cudicio.it/images/file/tijepixefevev.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ebv5dtolf9qscirk2hlff92qbo/45361788109.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_off0000b02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02C 10784 bytes
SHA-256: 4b91e6068868dcc2214c196195aa271379b6443e1a5342bd6e227afa736992e8
font_01_sfnt_off0000c8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F0 15516 bytes
SHA-256: 4dfc3fc5381129e40dd7a0c80ea594f628a9be0e7e28038d5a7b48fa87af1afa
font_02_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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