Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b9178a0eee50c8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 13:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0af7f6e8376d8ce0626540d3b52911b3 SHA-1: 003396af09fbe3652cb279581e1bfd9b52134961 SHA-256: 46b9178a0eee50c83d1fccb6bf192f7ad0f0b8aa46c49cbda30e97ecb90ac8c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, forming a link farm designed to trick users into downloading further malicious content. The presence of these deceptive links and the overall structure strongly suggest a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://catamma.ru/uplcv?utm_term=nfc+file+sharing PDF link annotation
    • https://habrit.tw/ckfinder/userfiles/files/86531500682.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16313111522826.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/fumozudezaki.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/defigukazogusalatijadebem.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/99733136496.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/51884555584.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210921011050.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/28704998237.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/zitebanorokaxef.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caa34141c9---gimeritixifuxopegavuj.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092007104773499.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/kajatazamamudafubejet.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/15288658062.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/gozejubezexuxubebodod.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/38023121640.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/wagesijodevuv.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/23388996774.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/lanenafawapane.pdfIn PDF document text
    • http://ed-union05.ru/files/file/91728586675.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/3446960706.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3109134c5---pasinupofopepugozifofu.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/68595671884.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/mejezisu.pdfIn PDF document text
    • http://decentlogistics.pk/survey/userfiles/files/gadebaninuxibesegat.pdfIn PDF document text
    • http://webmenuplus.com/images/file/47997254277.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_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 10376 bytes
SHA-256: f07cff1c57fecb9c867cd355eac553ee6f53fdc6e2eb96e05a7d67631e8e7fdc
font_02_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 17580 bytes
SHA-256: 3fef748bd51ba0183d432976983a58d653e118f35cf05fd44deee3b0ab504608