Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ee1c5de028c08d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-09 01:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a9679079fe7e101b843b6ca4590d8ed3 SHA-1: c4d289f045960f48e3e462acf4d851c0a04b73c8 SHA-256: 66ee1c5de028c08dfaacf156fd14fc51b428bd12d5c307635bc489909e266064
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains malformed streams and is identified as a link farm, suggesting malicious intent. The embedded URLs and the ClamAV detection indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • 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://pankajplast.com/ckfinder/userfiles/files/sifemabora.pdf In PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/45689202519.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57156204374.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/72716409841.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/takuvopit.pdfIn PDF document text
    • http://identik.hu/editor_up/rufetinawaribunonareze.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/ganijutepusowotifunuzo.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/67037790154.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/36594941905.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/55832990697.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/66979464865.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161345d9b4d5b1---80718896710.pdfIn PDF document text
    • http://fitviewer.de/files/file/16350017848.pdfIn PDF document text
    • http://www.520amis.com/upload/files/makug.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/76736158619.pdfIn PDF document text
    • http://schokofontaene.de/idata/85092693840.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/44924454897.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/josisigonopevomewik.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/34889725620.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/4977521813.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/10817758505.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/26426522083.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/33901827362.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/87455388094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=watch+regular+tv+on+firestickPDF 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_off0000c56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56E 10864 bytes
SHA-256: 46733eda0e8c4faf81f57e5f95c4a6a47f2ee4fd7addbb180a099854cdad94e8
font_01_sfnt_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 17108 bytes
SHA-256: 270e3fafa0428496a6ff431593c827367a5a5e5f5f01a20a8b0db1639bc87904
font_02_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1