Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c4bbe952f21fd3…

MALICIOUS

PDF

70.3 KB Created: 2021-09-11 06:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72d38c3664cb5137cc8ee39fdacb9df3 SHA-1: daaada98c523ab42490ed3f8d16d51e87666e7bb SHA-256: e2c4bbe952f21fd31115a4f47350d57d49d9b738bb4d0389c56bdfe839670d3f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true malicious intent by using numerous low-reputation domains. The ML classifier and ClamAV detection strongly suggest malicious behavior, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://issaproject.com/app/views/panel/ckfinder/userfiles/files/rawudujijigipobumotuvovo.pdf In PDF document text
    • https://thegmsbihta.in/userfiles/file/lemokuzevozefajugepawe.pdfIn PDF document text
    • http://rrarental.org/upload/file/45937351218.pdfIn PDF document text
    • https://ibericadearmerias.com/file/72767474075.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/81093825669.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/ledusegaxajuvilamu.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/56159237936.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/rorejikogapudaloxebevefos.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/retekaj.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/33497415484.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/53176596115.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/92814503303.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/gexeziwexogivozo.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/03/18945182831.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/15361913910.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/44413922698.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/ludut.pdfIn PDF document text
    • http://mastervin.ru/files/file/1395520988.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/ximesur.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/zojeridagaz.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109100553153348.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/xovigutab.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/bivexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=snaptube+apk+latest+version+proPDF link annotation
    • 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_off0000b486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 15072 bytes
SHA-256: 10f4ae77c8f3e94b6300d722545dad4d66991b0d6a1f6e307f8e7669a78cc782
font_02_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 10716 bytes
SHA-256: df5f9a223d7a3fe1eb7f08d0fc078511da276b844b6f6690207472ebe6bfbe9e

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