Malicious PDF — malware analysis report

Static analysis result for SHA-256 34fb505655767b57…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 15:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: b0b317ad300d8f65ade3dadb8211918d SHA-1: d9fd237fd25101ca5b8fa84c142fc05f03cac182 SHA-256: 34fb505655767b5775a7b64f38cd26b05b7b3b2a8e7f8fe29e6a11e32d994cb5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, such as the identified `synerhu.ru` domain, which are often used for phishing or distributing further malware. The high ML classifier score and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=damon+ps2+pro+unlocked+apk PDF link annotation
    • http://schokoladenbrunnen.de/idata/mapovumex.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0ca5a5b72---45623524146.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/ziwowojojiwiloxapasemopo.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/66828055693.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/90750265923.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/pilol.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/60625076353.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/16635120827.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/77006060728.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/14640169720.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/xowawodezubemo.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/gilunuxugidukuxa.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/76248857676.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109110150437520.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109030750422407555s2rvc.pdfIn PDF document text
    • http://linker-apps.com/files/jilakexutigogowot.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/9101981477.pdfIn PDF document text
    • http://proxima-design.cz/files/file/gipifoxamugepudil.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f029f0e321ac889e4d1410d12a2dd3b9/29718830704.pdfIn PDF document text
    • https://datenglagi.com/contents/files/mubuwowutumuzek.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/zagepatepepa.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/waposidojenamixofozix.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/56513127563.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_off0000bec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC0 10796 bytes
SHA-256: 87106919c6d29d731f729f018c28855f78be1d853c08142586ee05d6d83bda23
font_01_sfnt_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 17192 bytes
SHA-256: 75d12605bc753e47033fc19d69a08ce2a0b7884cec240d574df55f92de34fe0d