Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc9cc4e9ff7b0a8…

MALICIOUS

PDF

67.7 KB Created: 2021-09-27 00:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cd70f130446187d110eb9ce1cfe092bf SHA-1: 731f4bce54235841c3e322133b053ac989c5d709 SHA-256: ffc9cc4e9ff7b0a85245290ed6dedfa72b563680c388c525ea590dc0649689a0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=dark+play+apk+2020 PDF link annotation
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/99264941201.pdfIn PDF document text
    • http://hanifeugur.com/image/files/pixewaxibudotivalapaf.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/33922646419.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/nesumiju.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/vozubuwej.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/48321724467.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/zonujebopame.pdfIn PDF document text
    • https://nls.vn/upload/files/xejafajapilezibowudujar.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/109386066.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/7460752068.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///kikovadumu.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/kofim.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/21205751591.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/90144974412.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/popapesobimomudepupid.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/tesuvexumositomuwu.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/20971610180.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109201633267697.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/fujenaxunukamozosebilaku.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/94498329257.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/vezirasekod.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_off0000ab64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC376 16004 bytes
SHA-256: 851667459289915205fe24ed128200df43066e20aa3edf22595f50ed5e082810
font_02_sfnt_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 9980 bytes
SHA-256: 6a58ef029b8acf3c0d56a1f42429973ed86e1f7ed1a40c2372cbbc20cede21df

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