Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39ebc5cd3af8740…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 15:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cd73a8748eb41ca78f4f71dd638a94d SHA-1: 44b3a7344a994db18d8970e930e0f0b5d33b7266 SHA-256: e39ebc5cd3af8740d94b5b07546da0b537bddcd51a54cdcd53233239fc313253
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm with numerous external URLs, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous embedded links point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://american-security-inc.com/assets/ckfinder/userfiles/files/42426052532.pdf In PDF document text
    • http://modernplating.com/userfiles/file/zapixeni.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/30629297111.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/sokefap.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/rabekadazakuxike.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/92895351595.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/4995523688.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/67450686471.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/92498374137.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///janerujomalebo.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/wogupaxuzusuf.pdfIn PDF document text
    • http://meditopthailand.com/file/16026866483.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/nerunojibupinuritagov.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/42304894028.pdfIn PDF document text
    • http://ukrfirework.com/images/file/38711172687.pdfIn PDF document text
    • http://cssh.es/img/file/jimavidabunogokivu.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/mumuwofudogejuz.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/61156331099.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d0be09521f9a6f342eaa971e29f32fd9/88130064532.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/zoxurebalugamuzuw.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/42rq4iu4bp3luegg0vq3994483/vuzikokuwulokive.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/bipegufapa.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/kosigagibe.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/futujin.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/xifivusepamojiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mobile+legend+cheat+damagePDF 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_off0000b40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 10684 bytes
SHA-256: 1216a28922b5bf1b8434b0e593e559fdd345a8291b2441544db06bd64bfca5d0
font_02_sfnt_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 18004 bytes
SHA-256: c1a8cbc700dd99c455d6bcaab43cb9701efda115ca2462a48d6eb40c1131fd31