Malicious PDF — malware analysis report

Static analysis result for SHA-256 4466732a045d6f41…

MALICIOUS

PDF

84.1 KB Created: 2021-10-08 02:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 92bbb0e0b605b67d3b8834cc30d0b755 SHA-1: 3c143a81b9075e4e6ec1a2b1ecc4fddaa7f09a8a SHA-256: 4466732a045d6f413e386030b6231db9f787f57fd578b4fc0375a13bed2abbe1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://macauroommate.com/ckfinder/userfiles/files/bekegoruzif.pdf In PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/68615565146.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/xoxozixikiriradi.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/xejufedaxewijefe.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/pumowaxed.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/91895510497.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/9123180969.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/273938329.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/35761234362.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/pigixidamivolezipalejuzun.pdfIn PDF document text
    • https://crawfordpoint-ca.seeninherd.com/files/65700090111.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/63935686850.pdfIn PDF document text
    • https://obrbikes.com/files/files/17243707548.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/81986773167.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/jezuposimixosasab.pdfIn PDF document text
    • http://leguido.net/files/23309206875.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/77637665824.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/bosuf.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/davijeliwodaku.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/wozakesenexizadedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=changing+hearts+2002PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012a26.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A26 16888 bytes
SHA-256: 65ec3de44c6767b8e65203987ef3fdcb051680f0a6e754af9a448a5e13c569ec
font_00_sfnt_off0000cb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 10496 bytes
SHA-256: a5d46c47e58c7517817a8c556cde0660a9a4ebe3dbc91b151ac1e4f41c313a34
font_01_sfnt_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 18220 bytes
SHA-256: fbc962c49110ef53b6e7ce2a903f45c5366f51e14578fd4cf6926884e3a22f72
font_02_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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