Malicious PDF — malware analysis report

Static analysis result for SHA-256 8579bc62a4c938f1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 19:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a29421e8dc0d59942141ccbc586a82f6 SHA-1: fee057c8a9a133f439bc59f765ee2a036a250966 SHA-256: 8579bc62a4c938f146c6e5d312e961ba251fdc22e6902d1b02e809bcd9478a2b
134 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to malicious sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=real+moto+hack+apk+download PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5994e1ff---fofajuzopobizegaborifopup.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/33663378038.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/negebixapam.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/19487325806.pdfIn PDF document text
    • http://epmachine.ru/d/files/83888334731.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/16693560299.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/297146323.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/51942846237.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/55799717789.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/wepififeniwimakapifotolok.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451a4dc7447---56299573331.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/kulotu.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/424711327.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/4282330879.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/75359131837.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/8623757479.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/42078771241.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/34172089875.pdfIn PDF document text
    • http://nenorm.com/files/files/fajep.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/goduzugitasifewubeve.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/pikipu.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/katatiwujenudufesevukuv.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/21403451374.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/tutowugamejaxikukosupesiw.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/jotepab.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_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 10644 bytes
SHA-256: 820895c7b2521b728bd566b59fd48e30816f5f448142923fab115a22b71b18e7
font_02_sfnt_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 17900 bytes
SHA-256: 988613fab871d239d2d7ef99191ef4f1e02c36fff0accc544ec7cb3fed8825f9