Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d7d749ede71a38…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 02:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e486429788b83a39e2a2f9ecfd4ab3d3 SHA-1: 8f38b0e59aa2fec608dcbb80a850fb15f31fab45 SHA-256: c4d7d749ede71a38f3a8b41bd329b81e4b563192fc0c426cf99a12f3b7379c23
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the overall structure point towards a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=android+8.1+frp+bypass+apk+download PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135164da5e88---12980721054.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/72803364847.pdfIn PDF document text
    • https://eklyps.net/images/file/nemija.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/39224055624.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/6ii73voaaibvh7ahrtnb6qi826/29302687994.pdfIn PDF document text
    • http://hidramaco.com/files/files/tozipexaw.pdfIn PDF document text
    • http://casauthienan.com/fckeditor/editor/filemanager/connectors/php/temp/file/76676560811.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/laseluvukuxipun.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/joledesekazumovar.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/fokakafa.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/bojosonopesepejadev.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/83390653493.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/76112087529.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/55633609278.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/56664540628.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/metifujomabu.pdfIn PDF document text
    • http://fabtur.ru/upload/files/65557039196.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/63783615149.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210926021851.pdfIn PDF document text
    • http://innotack.com/userfiles/file/kifabomuxekufowonurimaba.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/zaxusapuvumugiwosuloj.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_off0000ae19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE19 16772 bytes
SHA-256: caaaa9cdfcb44f04f7c8161487b8746ca46b44e121c83e52257ec6fa0d7e135c
font_01_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 11000 bytes
SHA-256: 3cc7377578def692653c59915d2f40146fb5d87e5e0de7fafc7a0c1a50bd006d
font_02_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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